Yeah, LSSJ Broly M8 has to be above SSJ Goku Buu Saga.
He has to be above someone who never even existed and has nothing to do with the plan and basis of the movie.
The entire claim for M8 Broli being stronger Boo Saga SSjin Goku is based on weak points.
First one, is the Daizenshuu that says Broli's power surpasses Goku. While I have no problem with M10 SSjin Broli > Manga Boo Arc SSjin Goku. I don't think this line even makes sense to begin with. Goku was totally irrelevant and never even showed his capabilities in the anime until after movie 10 was released.
Your second point is likely because Gohan states "Broli is a bad a monster as ever". But that can mean Broli is the same as before, meaning still strong. It can also mean that he got a lot stronger overall. In no point does it imply that M8 LSSjin ~ M10 SSjin. It can easily mean M10 SSjin Broli > M8 LSSjin. And we know how powered up villains get when they come back.
Base Garlic Jr (Anime) > Buff Garlic Jr (Movie)
Initial Metal Coola > Final Form Coola
So, what's wrong with M10 SSjin Broli > M8 LSSjin?
What I'm trying to say is, that it's ridiculous to compare a character A to Character B because they have zero to do witht each other. The obvious compassion of Movie 8 Broli is Cell in his respective levels of Warm up vs Vegeta, and the suppressed level he used vs Goku and Gohan in the CG. How much I'm sure of it? I'm ready to gamble my whole bank account. I learned the series to a microscopic level, and you can see it in the comparison I made between the movies anime and Manga. Absolutely everything supports this theory, and not even a single one that refutes it. This is science at his best. It's the CLIMAX!!!
I rarely debate about it anymore, because it gets really annoying to talk to a person who I'd audacious, and dares to even go against this, when he doesn't even have a simple basic knowledge about how the movies even relate to the series. At the time someone will break down these things like I did, he would have a right to talk and attack me. Otherwise, you people just shut the fuck up.
P.S: The last paragraph isn't treated to you or anyone in particular, but just in general.