I don't know what you could possibly argue to say Tito won. Tito was outstruck 4:1 or 5:1, that's bad enough, but if you look at their faces, Tito's face looked fucked up, Forrest looked relatively fine.
Here's a link to Ortiz's face: http://l.yimg.com/os/388/2012/07/08/...jpg_160922.jpg
Here's a link to a Helwani interview of Griffin: UFC 148: Forrest Griffin Told to Get the 'F' Back in Cage by Dana White - YouTube
Who looks more damaged? I don't see any argument. Griffin landed more, tagging Ortiz the whole time. Ortiz got a takedown and did very little GnP and two knock-downs - that doesn't win you a fight where you eat 250+ strikes.