Which part, Stanton or Andujar?
For the latter, I guess because he isn't the stereotypical "slugging 3B that can't handle the position". He has plenty of athleticism and a good enough arm, he just doesn't seem to have the hands or twitch reflexes for the position. But he isn't slow or unathletic, so why not LF? Maybe not on the Yankees, but somewhere.
For the former, uh, I guess, look at the guy. He's huge and has past injury problems. It's only a matter of time, really.