I like JT and I think he's going to turn into a very good player. But if he can be traded for the #2 pick along with Cisco, it's a no brainer. Take Thabeet and have a big man rotation of Hawes, Thabeet, and Diogu. You have post scoring, passing, rebounding, and shot blocking. The only thing you don't have is experience but that will come. I'd rather add Thabeet to JT and Hawes but like Brick said, adding Thabeet is a step towards being a defensive minded concept which is a good thing.
With the #4, draft Rubio or Evans. Thabeet can be very effective in the pick and roll with Rubio running it. Otherwise, Evans adds size, thoughness and athleticism. This can be a big turnaround for the franchise if it ever happens. Doubt it will though.