While you guys are probably correct, I could still see Danny take a flyer at him. Danny values athleticism (Marcus Banks, Ricky Davis, Gerald Green) highly, especially where the cost is not great (eg POB). More times than not he strikes out, but eventually he will get lucky. I mean, what's ten days??
Well, other than Ricky (who was not just an athlete, he was also a very skilled basketball player), most of Danny's athletic targets have been in the draft. I agree that Danny does target athletic guys later in the draft, rather than more skilled guys who may not be able to keep up in the NBA. I think he believes it is easier to turn an athlete into a basketball player than a basketball player into an athlete, when they are coming out of school.
However, it is different when they have shown that they simply cannot play NBA basketball. It is one thing to project a guy coming out of college, because you don't know what will happen when they get in an NBA system with NBA coaches, but Williams has been with NBA coaches for a few years now, and if anything, he has regressed.
So while I think there is something to your theory about Danny liking to take flyers on raw, athletic players, I don't think there is much evidence of him doing it outside of the draft.