What this is is a lateral (at best) basketball move that makes a ton of sense off the court.
While Bass is not really a better player than Davis, he is not nearly the headcase, and even more importantly, he is only signed for 1 year and a player option (and if he plays well this year, there is a great chance he will turn down that option).
Considering it was looking like Davis was going to get a multi-year deal from someone, this was a bit of a coup to be able to replace him without using any other assets.
Now the C's still have their MLE, and Jeff Green, and they are pretty much set at PG and PF, and perhaps the wing if they sign Green.
Not a bad start. Now its time to finish Danny.