if you go strictly by era adjusted points, the hossa marner comparison isn't far off. for the playoffs from 99-04, and 06-09, teams averaged 2.45 goals per game, while hossa averaged 0.61 points per game. from 17-24 teams averaged 2.86 goals per game, while marner averaged 0.88 points per game. taking the ratios of average individual points per game over average team goals per game we come out to 0.24 for hossa and 0.30 for marner. leaving aside the caveat that marner also averaged about 2 more minutes a games than hossa did, those numbers are still pretty close with a margin of error in favor of marner.
there are two catches:
a) if the idea is to pay marner 14m, that would be the 2009 cap% equivalent of 8.32m, 3m more than the contract hossa signed. such a contract would have made him the 5th highest paid player in the league at the time behind only kiprusoff, crosby, ovechkin, and heatley. i don't think anyone is realistically offering that july of 2009. the hawks would've had to forgo signing kopecky and madden that offseason and they still wouldn't be cap compliant by a few hundred thousand.
b) the 2024-25 blackhawks are not one fifth the team that the 2008-09 blackhawks were. marner by himself doesn't make this team a winner. at best he inflates a few young guys regular season totals and therefore their salary demands.