For the Wolves they don't believe in Williams, they buy into the fact he's immature and don't want that kind of risk.
It also gives them a lineup that looks like this.
Kevin Love, Mike Beasley, Wes Johnson, Ray Allen, Ricky Rubio
With Johnny Flynn, Anthony Rudolph, Darko, and Luke Ridnour
That's a really nice looking nine man rotation. They also get a first class veteran in Ray, with two years left on his deal that sets a great example, instead of another young cocky kid which they have way to many of.
They also could get rid of ten million of salary to garbage contracts which we take on, easy to do when you see all the guys making 4 million on their team.
Further, The Twolves have a glaring whole at the two guard.
Ray could really spread the floor along with Beasley, throw in the next Matrix in Wes Johnson, and The new fundamentals Kevin Love, and the three headed monster of Rubio, Luke Rid, and Flynn and that's fun to watch.
Example trade is Ray for M Webster, Pekovic, and Wayne ellington.