Look at the upside, Nesmith had a good run there for a rookie. Stevens gave him time to work on his NBA game and he looked great on defense. As you know, Stevens doesn't really play rookies except for some defense. Brown Tatum, Walker and Smart injuries gave him a chance and he was rookie Avery Bradley defense 2.0 which is really good.
Nesmith played 18 college games, thus, he waits.
The rotation for the last 5 or 6 games has been...
Tatum or Brown with
Robert
Pritchard
Semi
Teague
Stevens is trying to keep Brown and Walker at 32 minutes
Semi is scarily consistent. He doesn't make mistakes at either end and gets a point or two. He has good lateral quickness and has respect from opponents when he is on defense. He has played in countless big games and also, at the end of close games.
Once Nesmith starts to get minutes, whenever that may be, he will assuredly win a spot in the rotation spelling Tatum and Brown as he has a great three point shot.
Look at Robert, in two years he played 61 games at Texas A&M and he got very little play in Boston until late season last year.