A lot of people think Goku is gonna lead him to Broly. I think it's possible, but very unlikely. I don't think it's in-character for Goku to drag someone completely unrelated into a fight with another villain, not to mention that he'd be endangering Cheelai and Lemo (assuming, of course, that they're also with Broly in the manga still). Not to mention, Granolah wished to be the strongest in the universe, and Gas wished for it after him. The warriors throughout the universe would include Broly. I find it silly to think that Broly wouldn't just get outright stomped by Gas, but maybe he doesn't apply to the wish for some reason, or can just use his rapid growth to catch up before Gas can kill him (even though it wasn't portrayed as being THAT fast).
Not to mention, on top of all that, Gas would at least force Broly into Full Power Super Saiyan, why would Goku EVER intentionally make Broly undergo that form when he literally becomes a danger to the entirety of Universe 7 and is incontrollable. The only way to stop Broly after that would be to become Gogeta again, but there are multiple problems with that, not to mention that it wouldn't make sense scaling-wise (if Goku could beat Broly, who'd hypothetically overcome Gas, why wouldn't they just fuse to beat Gas).
The theory that Broly will fight and beat Gas just has so many things wrong with it, I can't see it happening unless the fight is short and Broly doesn't even go Ikari or beyond that, and his only purpose is to stall Gas, not beat him.