So I wanted to look at a larger defensive sample size re: LaStella. I didn't realize this. I just assumed when we got him, La Stella was a decent singles hitter, sound defensively, and could be used as a pinch runner. Well, I looked at his numbers. His overall career fielding % is .973. His best position is 2B, at .983. Hardly stellar. He has a career 4SB's with 3 CS. Not sure if he is a good runner going from first to third or second to home, but he is definitely not a base stealing threat. He does have a career OPS of .709.
I still believe he can be a great bench piece for us offensively. He could spell Fletcher or Cozart against tougher righty's as an occasional starter, or come in late in the game and play 1B for Albert or Bour. But to have him get 300 AB"s (which he has done once in his career in 2014 as a Braves rookie)? I don't think so. Last year with the Cubs, he had 192 PA's in 123 games. He started 22 games, of which two were as a DH. I think that's kind of the threshold for his playing time. I don't think splitting time with Fletcher is a short or long term solution. While we hope Fletcher will help with the bat, we know he won't give up extra outs/runs defensively.
I think you need to let Fletcher play. If Fletcher screws up, then give his playing time to Ward or Rengifo.