Was Drai playing C that year? I have no clue, but sure we can boost his value because of it.
I also assume during negotiations that height rarely comes up unless you know more than the average poster.
Ehlers can be a comparable too, he is another player who signed during that time frame, and his overall body of work is worse than Marner's, so Marner should be making a fair bit more.
Excluding PP points makes Drai's number worse too by the way, so if you are going to do it for Marner, may as well do it for him.
This is also all ignoring linemates and the defensive side of the puck, but if we only go on points up to that point of their career, Marner wins.
PPG at the time of signing (Marner's is at the potential signing time):
Ehlers: 0.66
Draisaitl: 0.72
Marner: 0.81
At the actual time of signing Marner had a 0.93 PPG.
Who is Marner's comparable? You are ignoring their career and going off a single year only. Should we be doing that on July 1st as well?