That is going to be tough to define. How about QBs who required significant improvements in some areas when they were drafted? It’s tough though since many sat. Did Aaron Rodgers need that time on the bench, or was he just stuck behind a great QB? Or how about Goff. He had a bad first year and is blossoming in his second, but he did not seem to have a lot of flaws needing fixed when he came out. But it still took him that time to put it together. Dunno. Good question.