I think we thought we'd see that he's gone on the parental leave list (or whatever it is called), so this is a bit odd. Perhaps they feel the poor kid has too much happening right now to have success at the ML level. Send him down, let him relax, become a father, refocus, gain the confidence back, tear the cover off the ball, learn to play LF better, then re-emerge for another shot in the majors.
Or perhaps they just don't want Donny Baseball wearing off on the kid