Even with Contreras in the OF (and I agree, he won't be there much) there's still a major crunch for PT if you bring Fowler back. That basically turns either Baez or Zobrist into a utility man. Is that going to happen? I have my doubts. Fowler did a very cool thing, taking a discount to bet on himself and chase an unfinished dream. He'll cash in this time - and he should. I don't see him coming back.
With the knee, I think the Schwarber at C thing is done for at least a season and maybe period. Montero's back is so fragile at this point (and his throwing so terrible) I don't see the Cubs going without another pure catcher on the 25-man roster. And sure, there's a good chance that would be the guy who catches Lester (though I'd love to see Willson be that guy).