I think Sosa is better than people give him credit for, I was a bit surprised to see 4.5 WAR in little more than 800 PA, that's starter quality play off the bench. If Long could teach him to be a bit more patient, he could be a solid hitter, not Turner, but not a black hole either.
JT may benefit from hitting in the 2 spot b/c it could force him to be more patient at the plate, batting 4th or 5th I think he felt more pressure to hit and hit with power. Stott should come around and that'll balance the inevitable falloff from Bohm. Marsh still has to get better against LH pitchers, but he's been consistently around .800 OPS for a couple years.
So Castellanos becomes the big hole, b/c he's a liability on defense, he's below replacement if he's below .800 OPS, much less .600.