I believe Soto goes down to AAA even before Zimmerman is back.
When Eaton and Murphy return (which could be a week from today), you have the regular infield plus Difo for 5 roster slots, 2 catchers, 5 starting pitchers, and at least a 7 man bullpen, perhaps 8 if you don't want to send down Solis as well as Suero and Gott (Grace, Madson for decisions, and there's still 8 in the pen before the first two moves). That's 19-20 players before you even get to the OF. You are probably keeping Adams and Reynolds (who can play 3d and maybe 2d), so that puts you up to 21-22. Eaton plus Harper gets you to 23-24, leaving Taylor, Goodwin, and Soto for 1-2 slots in the OF, and those 3 plus Solis (or release / trade Kelley) for the last roster slots.
Probably you see Soto sent down to maximize depth, Taylor / Goodwin splitting time in center, and some sort of pitching move beyond Gott and Suero to get down to a 7 man bullpen. Bench is a little too left handed for my taste, but that's not easily fixable.