Nobody mentioned it, but Celtics should also have Sasha's early bird rights, since he played here for two seasons (
http://m.weei.com/sports/boston/basketball/celtics/paul-flannery/2012/06/15/stay-or-go-look-celtics-free-agents - I'm not sure how credible this site is, but that's all I found).
That means, he could be signed to a contract that equals average nba salary (which I believe was over $5M last season) or less, that combined with a draft pick (Charlotte's 2nd?) and cash might just be enough.
Rockets also seem to collect non-guaranteed contracts, so S.Williams and E'Moore could be a part of a package. Just as JJJ could, because it looks like they stockpile PF's

I'd rather S&T Pavs then Dooling, who I'd like to have on the roster next year - he provided good vet presence and I think he had a good influence on Rondo, but I guess RayRay would disagree :/
I hope it all makes sense to you, because English is not my first language and it's not easy for me to articulate such details.