The closest comparable you were able to cite for Mitch Marner's current contract earlier was Patrick Kane's post ELC deal, which was signed 10 years before Marner's under a completely different CBA, had a cap percentage difference of 11.09% vs 13.37% and was only superficially similar based on PPG averages.
The closest comparable I found for a high-end playmaking winger who was good right from the start was a high-end playmaking winger of similar age who was good right from the start, who had one of the more similar post-ELC contracts in cap hit percentage and term, and one of the closer production statistics and development paths. Not sure why you're choosing to represent that as an unusual choice, especially when you were previously unwilling to even commit to a comparable. I was willing to consider yours.
Comparables will never be 100% identical, but Kane is a good comparable, and one that many people have used for Marner. The separation between them is easy to see. Marner was a better player, and got an extra year of term, and his cap hit percentage is higher by a proper relative amount to account for this.
The fact that you're not able to produce a high volume of suitable comparisons for the Marner contract, aka "sample size," really only says one thing. That his contract was unprecedented.
High volume? How many players of Marner's quality do you think there have been in the entire cap era? Hint: It's not many. There's nothing "unprecedented" about Marner's contract. There are many players above him in contract value throughout the cap era. Including wingers. Including wingers who were worse than him. Multiple in fact.
Marner's comparables are clear as day. It's Rantanen and Aho.
-All three are 2015 draft picks.
-All three three walked into RFA status at the same time.
-Each one finished their ELC with a career high of 94, 87, 83 points and would be considered elite producers.
But because they both signed for lower, we need to go look at Patrick Kane.
Are you kidding me?
Rantanen is literally one of the two first comparables I cited. Literally today. To you. Right here:
He fits in decently relative to most high-end post-ELC contracts. Kane and Rantanen are probably the best comparables, and Marner's contract makes perfect sense relative to theirs.
I did not choose Kane to suit any argument. It's literally one of the least favourable high-end post-ELC winger comparisons for Marner. The contract closest in actual value is Vanek's, but I figured that was an unfair comparison, as it represented Marner so favourably.
Aho and Rantanen contracts aren't even all that different from Kane's, so i don't know what you mean by "because they both signed for lower".
If you'd like to look at Rantanen/Aho, let's look at Rantanen/Aho...
At time of signing their post ELC contracts, their P/GP was:
Marner: 0.93
Rantanen: 0.87
Aho: 0.81
And if we were to remove the noise of EN points, which Aho and Rantanen actually had a considerable amount of, we'd end up with:
Marner: 0.90
Rantanen: 0.82
Aho: 0.76
And their primary points/GP...
Marner: 0.71
Rantanen: 0.64
Aho: 0.61
And without EN...
Marner: 0.68
Rantanen: 0.59
Aho: 0.56
And when we look at more accurate metrics than per-game, and consider things like PP TOI which skews raw production...
ES Points/60
Marner: 2.56
Aho: 2.17
Rantanen: 2.13
ES Primary Points/60
Marner: 2.05
Aho: 1.70
Rantanen: 1.58
ES Goals/60
Aho: 0.99
Marner: 0.86
Rantanen: 0.78
PP Points/60
Marner: 7.19
Rantanen: 5.78
Aho: 5.37
PP Primary Points/60
Marner: 4.69
Rantanen: 4.15
Aho: 3.48
PP Goals/60
Rantanen: 2.37
Aho: 1.60
Marner: 1.56
Marner clearly the best player of the three, with Rantanen and Aho being fairly similar, and comparable with Kane. Their contracts reflect that.