On a team with multiple offensive liabilities, Craft makes them look like offensive savants. While he's good at creating pressure defensively, he succumbs to pressure just as quickly with the ball. He hit a couple of big shots in college, which cloud people's memory sometimes, but on the whole he was a liability with the ball in college, and that's not likely to improve in the pros.
He can show up to summer league or training camp for the C's, but that should be the extent of it. He's not better than Pressey (and I'm not a Pressey fan). He's not appreciably cheaper either. Vs the tax and hard cap, they'd count the same.