I do not believe the fights are fixed but i did feel at the time that the early stoppage was a nice way to ensure that tito not mess up and lose out on a cash in at the beginning of the year with Chuck.
I have wondered the same thing. It seemed to me they pulled Tito off Ken a little too fast. The announcers seemed to agree that Ken wasn't intelligently defending himself during a barrage of what was something like 5 blows. Not sure what Ken's game plan was there, but it didn't really look likewas knocked out or anything in my opinion I'd really like to see the two of them fight again.
As for fights being fixed, I have a DVR and was looking at a clip from a match from Ultimate Knockouts 4 that looked questionable. I'll see if I still have it and IF I DO, will create a new thread on the topic.