For all the talk of $10m+ for any of these players... ask yourself this...
If Nikita Kucherov, giving up 7 UFA years, having a 39 goal, 100 point season signed for $9.5m over the exact same period of time... while also having proven himself the year prior with 40 goals & 85 points in 74 games, why are any of these guys getting substantially more?
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ONLY guy you can make a case for is Rantanen, given that he had 29 goals and 84 points last year, but he still doesn't score like Kucherov does.
I can't see Marner getting under 10x8. Kucherov was brought up earlier as a UFA comparable, but I personally think that you're about to see a Kane contract for 10.5 over 8 for Marner, with Kapanen on his way out the door if the leafs insist on keeping Nylander due to cap implications. Kane is a very similar player to Marner stylistically and role wise for his team (PPQB, play making wizard).
Kane was paid based on what he HAD done (in winning multiple cups), and look at where Chicago is now, partially because of those deals.
The negotiation for Marner should be very simple -- do you believe you're a better / more valuable player than Nikita Kucherov right now? He's not... and unlikely to be at any point in the next 3-4 years. So pay him somewhere between $9m and $9.5m, accounting for the fact that if the Leafs want to have any hope of winning, that road goes directly through Tampa Bay.
All that being said, philosophically, we've seen the paradigm shift with players wanting to get their big bucks guaranteed on their 2nd deals, taking them to a point where they'll be 29-30 on their next negotiation. The league is continiously getting younger, at 29-30, you're often looking at players potentially past their prime.
You can certainly make the case that if you remove all uncertainty about future CBAs, these guys would be better off to sign 5 year deals that take them to 26-27 and then go the way of John Tavares this summer.... but if the alternative is an 8 year deal at $9.5m ($76m) or 5 year deal at $7.2m ($36m -- assume you value those 3 final UFA years at $13m), then that's a ton of guaranteed money to leave on the table; especially if you believe the PA will be successful at reducing escrow.