I think there is still something to be said for hundreds of games and years of experience seeing the ball come off the bat and running routes. Plus, Schwarber is in far better shape than he was his last stint playing LF for us regularly. He made 5 starts in LF last year.
In the story JT says he might shag a few balls in Clearwater but that's it.
Finding someone to play LF once a week is not really that hard (especially when our CF is really good at it and our LF is really good at RF). If there's an injury Wilson does it and Stevenson or Clemens (if he sticks/clears) or even Mercado (who is a good defender) would be up.
It sounds like Miller is indeed our next SS but I doubt it will be this year. Would be a good problem to have.