As for below average top lines on teams that have won, obviously there aren't any. But that said, even the best teams deploy a forward lineup that is suboptimal
For example, edmonton's best line by far would be McDrai - yet that isn't a permanent fixture. Pit separated sid and geno when they won cups, and Chicago had Kane and toews on seperate lines at 5v5
Every team in the league could stack their top line and make it better, yet they go for depth. Ehlers and Schief are our two best line drivers, it makes sense to have them each driving their own lines
As I've said before, the problem we have is a lack of super top end forwards - so I think the Jets have opted to maximize what they have through depth whereas what you're suggesting would hurt the depth of the forward group