I wouldn't pay 20M in two years for Asik. I watched him play this summer in the Eurobasket and he was terrible (just like Gortat, by the way).
Asik doesn't fit with this year's Cs, he is a better Perk in the Perk role, and it would've been good before, but right now he could help a team like OKC, but not the Cs.
Houston will try to send Asik and maximize his return, but his contract is a big no-no (cap hit 8M, but you pay him 15M next season). You won't be able to use him as a big expiring contract next season, but still overpay him. And no, the fact that McGee is making the same money doesn't help.
If Morey wants Rondo I want the right to swap picks with HOU every year until 2058, plus Harden. If you have a leader, you don't need to trade him.