Every season that passes, that label is looking less true:
Geno Smith continued to be serviceable for the Seahawks, taking them to the playoffs more than once.
Baker Mayfield actually had a better season after he left and is picking up where he left off this season.
so...I dont mean for this to come off harsh, but what the heck are you talking about ? Saquon came into the league with a poor Giants offensive line, Quarterback play and was able to overcome that for many years, injuries not withstanding.