I won't predict a winner, but I predict controversy. I have a hunch UFC encourages refs to bend the rules for their favorites, so I predict the ref will break them up after Stipe gets top position and it looks lke hes about to pound Ngannou out.
They want Ngannou to win so this is their way of bettering the odds, have the ref to make bad calls to keep the fight where he is strongest (like what just happened in that prelim fight, bad standup lead to the guy who was on top being KOed).