Do you REALLY only seriously begin to develop a guy who is going into his 4th year? I would think by then that his game is pretty well developed, for the better or worse. You can certainly fine tune it; but the only real gain would have to come from scheme and the complementary players you put around him.
Rams were very fortunate to get the right guy to develop a young Goff entering only his second year, while he was still moldable, before he got set in his ways. learned lots of bad habits, and was beat up physically and psychologically.
