Board Thread:General Discussion/@comment-35452151-20190106162320/@comment-36939983-20190125142434

Gogeta most likely saw broly as a threat. perhaps you feel it is a little brutal but when you consider that broly could easily destroy the planet with his constantly increasing power. this is probably why gogeta was as merciless as he was. because with the level of power we deal with and how broly was going beserk he could accidently destroy the planet. its easier to kill the enemy then risk them blowing up the planet *cough* frieza *COUGH*

as for if MUI could beat broly, i think he could. MUI is a powerful state of the gods and perhaps the only determinging factor would be that MUI is very short lived because its not a form goku can handle like a super saiyan transformation. broly is just rampaging as a full power super saiyan so he could outlast Mastered Ultra instinct.