Not trading for him may be the safer choice. But right now the NBA is as wide open as its been for a while. Westbrook would give the Bulls instant credibility. And if you can get him cheap in terms of talent, its worth the risk. Who else are they going to use the cap space on in the future? Every time they try for FAs they miss out, this year they werent even considered by any of them.
I mean:
Carter/Lauri/Porter/Lavine/Westbrook is actually an interesting team.
Not sure if the cap space works though. I guess had they not signed Young, potentially they could have gotten rid of Dunn/Felicio and been really close.