As far as the source, I'm not sure.. I came across it googling..
As far as his game, before the injury, he could start at PG on any team.. I don't really remember his defense, but I know he was for sure an offensive threat.. He's a smart player, which could go a long way with the sixers.. Put him and AI on the court together and let Williams run the point, he'll make plays happen.. He was super fast, and strong as heck..
Now, they say he's even stronger, and develop a reliable jumper.. Says he's still as smart of a player as he was before..
Overall, IF this does go down, he'd be a really good bargain for a low price..