Thats like Vito Belfort arguing that he would have won if it wasnt for the front kick that knocked him out....seriously. Who cares what he was doing, he got TKOd, period. Can he argue about how the fight finished?
Factor in that he landed 320 shots the last fight, controlled position for 4 1/2 rounds and still lost, are you saying that because he took Silva down in the 1st he would have won? He inflicted ZERO damge from the top, had FULL mount for 1 full minute, and in the 2nd was unsuccessful in his takedown attempts. Yeah he tripped and it completely changed the fight..but he made the decisoin to try that spinning backfist. He did not slip on the canvas, he made a horrific decisoin. And anyone who has fought in the street, competitively, or whatever knows that anything can happen. One small mistake can change the fight completely, and it did.
Silva made the mistake of getting taken down in the 1st, he adjusted and recoverd. Sonnen made a mistake in the 2nd, did not recover and lost.