The Cubs didn't just pay $13 million for a defensive substitute. I see Fowler as the everyday CF with Heyward in RF and Soler (if not traded) as the defensive sub for Schwarber.
Yeah. I think you're right. Schwarber and Soler will be a platoon, with Schwarber either catching or DHing most of the times that Soler gets the start.
Of course, Joe Maddon being Joe Maddon, we're going to be seeing a near infinite variety of lineups with the multiple versatile parts the Cubs have.
I think Szczur is going to have to hit about .900 in ST to not start the season in Iowa. The last position spot comes down to if some other infielder can beat out LaStella.