Vagrant Lustoid 2

I don't see how people can believe that they were MSSJ in Movie 8. It's quite literally impossible, because the majority of extra power from MSSJ comes from the fact that you can maintain the state and don't have to waste power transforming.

The fact that they transformed means that even if they had learned how to become MSSJ, the energy was spent on transforming, and so they cannot by definition be anything more than SSJ at this point, even if they've learned to master the form.

Hence, Broly's really not that strong. MSSJ Goku was hugely more powerful than Ascendant Vegeta, at least twice as much, who was in turn much stronger than a standard SSJ. Basically, even with all the energy that the others could provide to him, I honestly don't think that Goku's power would have been much over his MSSJ state, once he's given all that extra energy. And then that was enough to totally own Broly with one punch. That's at a level of SSJ2 Gohan vs Perfect Cell, and implies that there was a sizable difference in the power levels. Even if I assume Goku's boosted power was 1.5x his MSSJ level, the fact that he owned Broly so hard indicates to me that he was only ever around 75% of MSSJ Goku's strength, at a maximum, and more probably roughly equal to the power Goku demonstrated to Karin. That's how I see it.