you can't compare a SS/3B with an almost guaranteed 330 OBP to a DH with one. Certainly not in today's game. Check the fWAR projections on fangraphs for Colson. If he got called up today he'd be like one of our better players. I don't really care what his BA says when he's above average in adjusted runs created for his league at 22 and can play a cromulent middle infield.
But for now we have De Bong actually putting up some trade value so we'll probably have to wait until July or something to see Colson and that's a good problem.