Has he heard "undrafted"? Because that's mostly what I've been hearing.
You'd think after seeing how someone like Buddy Heild improved his draft stock this past year, that someone like DHam would think to do likewise. I've heard some NBA GMs say, the more they see some of these kids (ones that stuck around till their junior or senior seasons but don't improve much) the less they tend to like them. In other words, DHam would run the risk of casting a perception that he doesn't have much more upside if he returned and didn't show dramatic improvement. But IMO, he showed a lot of versatile game, but just not at a very high level in any of his game to get first round interest. Maybe 2nd round, but who knows? He could go undrafted. I think he had a great opportunity to improve his overall game and put up big numbers next season, especially playing on what looks like a more well rounded team.
Since we'll never know if he would have played himself into a high first round pick, it's impossible to tell if chose poorly if he ends up drafted later in the first round. But if he drops out of the 1st round or both rounds, then I'd say the educated guess here is he made a poor decision. I just think if he improved his shooting percentage and overall numbers just a tad, that he could easily play himself into the top half of the first round. There aren't many players his size that can handle and pass like he can. It's his shooting percentage and decision making that needed a tad more maturity.
I wish him well. He would have made next years team a tough NCAA E8, F4 or better out. Hopefully the sum of next year's parts will exceed what we saw this past season.