I look at it this way... when even Joe Rogan almost blurts out "WTF was that" watching the replay it's pretty bad. The UFC needed Silva to win this dominantly in order to set up his next fight which may be their biggest money fight to date. They put in their biggest company man to get it done. Sadly, he's not that smart, and apparently wasn't willing to take a beating in the process.
The best next fight available is Machida but I bet they give him Henderson. Bad news for anyone in the division for which Silva is champion as there isn't much talk of him defending his belt any time soon.
I'm not buying into your conspiracy theories. I think Forrest was out-classed, frustrated, and completely forgot his game plan, if he even had one to begin with. Granted, the last punch that put him out didn't look like much, but he was probably still fuzzy from the 2 prior knock-downs.
I admit that Forrest didn't look quite right in the fight, but there is no denying how hard Silva can hit. You rarely see Henderson, Marquardt, or Leben rocked as badly as what Silva did to them.
In the post fight press conference Silva said that there is no way he would ever fight Machida, he said they are brothers and that fight will never happen... For the right amount of money and pressure from Dana, who knows.