First off, going to a team that has PT available may not be best for CJ. That is likely to be a worse team and the players around him are likely to be less talented and he may be asked to do more than he is really capable of. Secondly, what summer league team you play for doesn't always reflect what team you may end up signing with. I think as others said CJ would be a nice 10th man or so on the Spurs giving him time to find his NBA niche and be able to play with great team mates. Dallas does seem like a nice fit though. They liked him. They have roster space at his position. He's not going to replace Shawn Marion but they don't need him to yet. Jae Crowder, while a nice player is not a small forward, does not have small forward skills. Crowder is an undersized 6'7" 235 lb PF.
Lastly, how does an agent allow his questionable 2nd round pick go to the draft and bring his family? What a huge let down for CJ. CJ could surprise some of us. He's never going to be a star but he does enough things well he could stick for a few years.