Stanley Robinson had the same problem.
I was thinking along these lines.
Roscoe looks like he's taking the same path as Stan, to some extent.
The fact is, his handle was weak when he arrived on campus, and in the 50 something games he has played over a year and three months, his handle is not noticeably better.
I also note that his repertoire of offensive moves is not noticeably expanded.
I also note that the effectiveness of his offense, compared to last year, seems to be about the same.
Conclusion - Roscoe Smith of 2012 is substantially the same as Roscoe Smith of 2011, plus experience.
Further Conclusion - It is extremely unlikely, for whatever reason, that the Roscoe Smith of 2013 and 2014 is going to be significantly different than the Roscoe Smith of 2012. Maybe he doesn't have the learning curve in him. Maybe he doesn't work hard on developing new skills. I don't know.
I know this, however - few guys who don't improve from year 1 to year 2 end up improving markedly thereafter.
No matter what, however, love the kid and his contribution to this team.