I think you're letting the position he plays cloud your overall judgement on who was the better hockey player.
No, in my opinion it`s about overall production. Stepan is average a 50 pts. player - where Chris is about 40. And look at Chris career stats and compare him with Stepan - I don`t even consider ice positions in such an evaluation. Stepan has 6 seasons above 50 pts. Kreider has his record year and only hit 50 pts. one time in his career - he is usually more cold than hot and my reasoning why Jeff Gorton should explore the market with him.