How was he not used properly?
If anything, how they used him helped. Putting him at pg would have further exposed his weaknesses. He averaged nearly 27 minutes in conference play. That's plenty for a guy that's best suited for instant offense off the bench.
This has been debated to death already on the forum...e.g....some players are better starters, then off the bench players. I'm not interested in rehashing. People are going to have different takes but in the end, no one can know for sure because we can't go back in time for a do-over.