CF Bryce Harper + LF Mike Morse or Tyler Moore > CF Dexter Fowler + LF Bryce Harper anyways, so why give up anything?
Fowler is a poor defensive CF with declining speed whose bat likely doesn't play in the corners when you take him out of Coors. At best, he's a fringy-hitting corner outfielder outside of Coors (184-point OPS split career home/away).