Talent-wise, Minny would be the winner of a JT-Williams swap.
I'm a big Derrick Williams fan (much thanks to his ownership of Duke in the tournament + Wildcat alum), but his skills have absolutely not translated to the NBA for whatever reason. I wasn't expecting him to be an All-Star, but at the very least, a 15-pt/8-rebound PF with 3-pt range and great finishing skills. Passing and shot-blocking were never going to be his strong suit - but unfortunately, he has yet develop a single strong suit: his FG, FTA and 3-pt % stinks, rebounding is below-average, and he barely registers anything in the Assist/Steal/Block column. He's had plenty of opportunities with Love's injuries, has been surrounded by arguably the best passer in the league, and is coached by one of the best offensive coaches of our time...I'm having extreme doubts that he'll ever figure it out.
Now the question is: how can he help this team? Well, he'll free us from a couple years of JT's salary, which considering Thompson's production and the need for size league-wide, is fair value. He'll help us space the floor - but how much better is he than Patterson? Patterson has actually shown greater efficiency in his career vs. Williams - so not sure he's an upgrade. Overall, I'm not sure what our front office sees in this other than offloading JT's salary...I think we can do better. Unless they're pulling for Minny to break their playoff slump, that is...