Maybe I’m missing something here, but Broly beat on Goku and Vegeta at SS blue level, forcing them to fuse. And while Broly did hold his own against Gogeta, he was almost killed by him. So to anyone saying Broly is stronger than those two, I don’t know if we watched the same movie or not, but I didn’t see that happening.
Jiren was beating on both Goku and Vegeta in ascended blue form and Ssk20 Goku. It wasn’t until Goku got to MUI that Jiren was finally getting overwhelmed until he broke his own limits, and even then he was still going strong. I can’t say Jiren would have done any better against Gogeta, but the arguments for here Broly aren’t cutting it for me. Jiren did what Broly did against both Goku and Vegeta pre-fusion when they were in stronger forms. And you can’t say Goku or Vegeta would’ve just gone into their strongest forms, which Goku said he can’t use the MUI anymore, and while Vegeta should be able to use the ascended blue form since he willing went in and out of it multiple times and is his own transformation, he still didn’t do it against Broly.
I think Broly is definintely capable of giving Jiren hell, but he sure as hell isnt steamrolling him, nor would Jiren vise versa. And if we use the “well Broly movie is a bit of time after ToP” argument, I don’t think Jiren has been sitting on his ass the whole time too. Maybe overtime, Broly gets the edge up, but from what I’ve seen right now, nah. Jiren has him in a brutal fight.