I invite all to watch this vid:
at 3:32, butterbean knocks down tengiz.
A harder fall than the shamrock's.
bean then runs at the grounded tengiz and commenced pounding him.
tengiz gives his back and covers his head.
the ref (Grant Waterman) runs to them.
tengiz rolls onto his back spread out, and bean is on top, then the fight continues and tengiz recovers.
Ken got punched down too, but the ref stopped it. I don't think the fight was given the chance to see whether it could have continued. Perhaps ken would have recovered; or perhaps buzz would have finished him off for certain. However, up until that point, there are similarities between the stoppage timing of Buzz Vs Ken and the (lack of) stoppage of Tengiz Vs B'bean.
Perhaps if the fight wasnt stopped so soon then there may have been no arsenal for the conspiracy theorists arm up.
Nevertheless, I am certain the ref did what he believed was in the best interests of the fighters that night.