Draisaitl played with McDavid a lot last year when the Oilers wingers were scoring regularly so it would seem that this is not the reason for the pairing. One reason to play the two together is because when they are hot they are almost unstoppable.
Draisaitl moved up to the McDavid line because Eberle and whoever else failed in that role, the McDavid line was struggling before Drai got bumped up. Then Draisaitl got moved to 2nd line center in the Anaheim series because the 2nd line failed.
Yes, one reason why they continued to play together is because they were a great pair last season (not so much this season) but the original plan was to have Draisaitl center the 2nd line so the main reason why he was moved up in the first place was because the top line wasn't clicking, not because he was ineffective as 2nd line center.
To address your previous post, I didn't say that it didn't matter who played wing on McDavid's line. I said that what you need is a speedy winger with decent hands to cash in his passes, basically if Cagguila had better hands. They have auditioned the likes of Cagguila, Puljujarvi for a time, Slepyshev and Aberg. They've been forced to move Drai to the line because the others who are a mish mash of tweeners or an overwhelmed young player. You get a scoring winger in that spot and you can then have your two best offensive players driving separate lines like the Pens do with Crosby and Malkin for example. Get Drai somebody better than a completely finished Cammalleri on his RW (we're stuck with Lucic either way) and you'll likely have 2 scoring lines for the first time since '06?
Maybe Nuge can be that scoring winger for McDavid but he's not a pure goal scorer like Hoffman is and to add, Hoffman would give a boost to their anemic PP which is one of the main reasons for team failure plus you save almost a million in cap for the next 2 seasons.
As I said before, I'm not even sure I do the trade because I do value RNH's ability to move around the lineup but I'm taking issue with those who are calling this a horrific proposal as if RNH is the far superior asset.