We have seen plenty of heavy favorites get finished in Bellator. It's just like the prime SF days, sometimes you have mismatches that turn into epic finishes.
But King Mo, Babalu, Petruzelli, Falcao, Pellegrino(went from SD vs Tibau to being KO'd by Pitbull in 6 months) were all finished in Bellator. Plenty of other favorites have been finished as well. There have already been a ton of upset this season on Bellator.