Clarke actually said they found Williamson when they were watching tape of Wilson, so he was obviously under consideration.
Fearne commented that Wilson had a lot of good European offers and signing him was a close thing after building a relationship with him at the NBL Las Vegas camp, so that might explain why Adelaide didnt get him. Signing Warren, who is very talented in his own right could well have been easier and less expensive.
As for Wilson's turnovers, consider that he was expected to do a lot on a team without a lot of other talent. For mine, his 3.4 topg in the VTB league are ok given his output as the competition's leading scorer. Ervin averaged 2.8 topg last year for Wollongong as the league's second leading scorer.