I saw this fight about 2 years ago. I seem to remember Bisping arguing with the ref immediately after it happened. So he was obviously not knocked out, and was cognizant (I've seen people say that Bisping was unconscious). I don't remember exactly how long it took him to stand up, but 15 seconds sounds like way too long to me. And as they were debating the situation, the ref obviously felt he was still able to continue. And he must have got back to his feet quickly enough for the ref.
I honestly don't think you have an argument. Just opinions, that go against the ref, and or judges. Maybe you just haven't accepted the facts that the rest of the world has, because you don't like them. But facts don't care about feelings. They remain constant.