Because Maia isn't an olympic level wrestler. Sonnen will take anyone down, he's a monster.
Also, Sonnen was giving Silva problems on the feet which allowed him to set up shots, he was generally fearless and just overwhelmed Anderson. But the key difference is the wrestling, Maia just doesn't have so was out of his depth.
When Maia took Chael down it was a throw/trip, but he was locked up with Sonnen. I don't recall Maia being tied up with Silva and that was the difference. As Chael promised he shoved his head in Anderson's chest and charged him onto his back which is wrestling 101, Maia doesn't have that ability. What he was able to do to Chael was tied to his high level jits and grappling, throws are sometimes used to gain position as far as I'm aware in BJJ.
Last edited by Hiro; 12-19-2010 at 06:59 AM.