The problem is that Exum isnt good enough in half-court situations and the high outcome possibility of Rubio is better than that of Exum. Exum getting his game tying shot blocked from a mile away when I think any other perimeter player on our team could have gotten the shot off was a bit of an example.
Exum had a quick release and he had to take that shot with the shot clock where it was. The problem is that his release is low and he doesn't have much arc and DRose had his 2011 hops and quickness.