Goodwin has no outside shot and he is a terrible passer, oh, and he sucks on defense.
The guy is really good at attacking the basket but you HAVE to bring more than that to the table in order to get consistent PT in the NBA.
That skill is also why he looks good in what are essentially exhibitions (like the D-League and Philly games) and garbage time, no one is going to sacrifice their body in a game that doesn't matter or is already in hand. If he develops a second ability then his career will look promising, but seeing as we're in year 3 and he is essentially the same guy we drafted I doubt it happens.