I have next to no memory of M6.. I know Coola was said to become stronger every time his body regenerated.. So did he display several power levels during the film? What do you have?
Can you explain me why Coola should be so strong? He is a clear movie counterpart to Android 18 in terms of strength. A preview for the next power in the series.
Both Goku and Vegeta also overpowered him. Movie villians overall are stronger than what's shown before and are immidietly surpassed later in the series.