Colorado
Skinner-McDavid-Teravainen - this line is a really interesting one! Obviously Connor McDavid is Connor McDavid - however there's a key of this line that I really like. I don't think McDavid is THAT great defensively and it shows in his FA/60 numbers - he was a lot better in his first two seasons than the last three (and he's better than the numbers suggest). A big part of this is a lot of his chances end up as quick fast breaks rather than sustained zone time and his linemates don't do anything defensively either. Enter Teuvo Teravainen.
Teravainen has consistently been a fantastic defensive player his entire career - in fact, every season he's played has been under a 40 FA/60 and his GF% the last three years is 56% or higher. His offensive ability has increased, leading to great 5v5 possession numbers. McDavid hasn't really had that kind of guy beside him ever - even Draisaitl's success with him is more of a fast break and PP chemistry than sustained 5v5 time. Teravainen may allow for McDavid to cycle and trade more than ever - an extremely deadly combination. EDIT: RNH may be the closest comparable as a linemate and Teravainen would be better.
The Skinner part? Not bad. He's very mediocre defensively but his role on this line would be to stand where McDavid can pass to him - easy enough. With his shot and speed to keep up with Connor, there's a high chance of some kind of rebound here. He's a year removed from 40 goals with a similar player. I don't think he's the driver of this line at all, but his PP value will be immense. Could you do better? Yeah, but this was a late pick anyways.
Line 2 - I'd usually say this line is a complete talented enigma, especially defensively but there's promise - Duchene is usually quite mediocre in his own end but saw a big improvement in a tighter Nashville system - he should really benefit from McDavid taking the elite guys on. To give Duchene credit, he's awesome at face-offs. Drouin's GF numbers are always mediocre despite alright FA/60 rates due to lapses - it's not like he's all bad here but he's prone to maddening inconsistency. I've never been impressed by Dzingel but his game is using speed and not necessarily creating possession. This line has potential to dazzle you with dekes and then the next shift make you want to pull hair out - but it has potential.
Line 3 - Heinen is a smart player who does a lot of good little things - he just couldn't make anything happen offensively this season. My other problem with Heinen is in the playoffs, increased contact renders him invisible. A rebound here is quite possible though and he won't kill you defensively at all. Dach had an average if not unspectacular rookie campaign, he has plenty of growing to do. He couldn't win a face-off to save his life but that'll change, and he provides good energy. Kahun is in a similar vein to Heinen with bigger upside and lower downside - I owned him in fantasy and he is the definition of hot/cold. In the last half of his Penguins days, he showed an increased defensive ability and hasn't been under 57% GF yet. As far as 3rd lines go, this line doesn't kill you and has some upside to help chip in.
Line 4 - Brian Boyle had his worst year ever this year defensively and I wonder if he's done, but he's a really good room guy. He can still produce a bit and he'll win you face-offs, but a nasty back-to-back 46% and 42% possession at 5v5 worries you. His GF% hasn't been above 50% since 2016-17.
D1 - Spurgeon is an extremely solid puckmover and skater, love that guy. He's a first pairing D and a huge part of getting McDavid the puck. I thought the hype on Girard was a bit high until this year but his rates dropped to around 41 FA/60 and his GF% hit 55% - with his ability to skate and transition, he's got a nice career ahead if he can avoid injury. This pairing is definitely above-average - in the playoffs, I wonder how two really small guys work together.
D2 - On one hand, we have Orlov, who is probably a tad underrated due to solid FA/60 numbers and ability to move the puck (by the way, the theme of your blueline being a puckmoving one is good for Connor). Despite that, Orlov has trouble breaking 50% GF at 5v5 and that is because of the odd lapse. He's perfectly suited for pairing 2. Nick Leddy, on the other hand, has been caved in defensively for three straight years (with 2 of those reflecting in his GF% stats). I'm glad both guys can move the puck, but I'm concerned about Leddy's horrid possession ability.
G - Devan Dubnyk - No stat can really defend his terrible season - which was bad enough that Bruce Boudreau had to go to Alex Stalock (!) as the No.1 goalie. It was a disaster on all fronts. My concern is he really wasn't too great last year either, with only a paltry .799 save percentage at high-danger in 2018-19 (.739 this year). I don't know if he's cooked, but it's heading that way. You'll need a rebound fast.
PP: Connor McDavid. That alone makes it a top 10 PP, and there's enough talent here to make it a top 5 PP...but it's possible a lack of consistency makes it fall just short. In theory, with Duchene/Skinner/Teravainen (maybe Drouin) - it'll have enough weapons to produce a lot along with the D that can QB by keeping things moving quickly.
PK: With Dubnyk's struggles, you'll have to have a really strong PK to throw out and while I think Orlov/Teravainen is a strong suppression start, I'm not in love with any other fits here aside from Spurgeon. Spurgeon plays PK a lot and is a premium shot blocker but his rates are just alright EDIT: To be fair to Spurgeon, blocking shots is a big part of the PK and he is one of the best - Leddy/Girard never play PK at all. At forward, you might have to play McDavid here as practically none of the others are used to minutes here.
TLDR: 1st line has potential to be the best in the league and is automatically awesome because McDavid/Teravainen combo. 2nd line will be way up in potential creativity and also maddening. 3rd line won't kill you defensively but it's upside is up to Dach needing to drive the bus. D can really move that puck and 1st pairing is truly unique being small yet effective. 2nd pair could work, but Leddy has to improve. Dubnyk is a big problem that may not just effect 5v5 but also the PK - because the PK is average at best with a good goalie nevermind a struggling one. PP should be great and lethal if Skinner rebounds.
I'd be tempted to try Drouin with McDavid on the PP because in theory, Drouin's hands SHOULD create some amazing passing plays with Connor.