The Tito/Shamrock stoppage was pretty good in my opinion. After watching the replay, it looks like Shamrock was Ko'ed by the second elbow. If you get a chance watch his hands on the following elbows, his arms and hands are stiff, the only reason there is any movement is because of the impact of the blows.
IMO, Shamrock was out, and when Herb came in and broke it up, he woke up. When Herb comes in, Ken begins grabbing at Herb, thinking he is Tito. This is just my opinion however, but it did look to me that Ken was knocked out, his muscles had stiffened, and he wasn't defending because he was out.