It's not like the thought hasn't crossed my mind. The producers prob thought they could add Gogeta w/o contradicting continuity at the same time. Retcons are fair game in SDBH as well.TheDevilsCorpse wrote: ↑Fri Jan 10, 2020 10:39 pmThis is questionable, I suppose. Vegeta suggests he knows the fusion technique back during the Boo Arc when he refuses to do the dumb dance inside of Boo. So one could argue that UVM!Vegeta just isn't as "forgetful" as Super!Vegeta almost pretending like he's never seen the kids fuse.
Or, in true Heroes fashion, they didn't really care about the finer details because they just wanted to use Gogeta. Even the anime adaptation, while definitely its own thing, had Vegeta tell Geran that they didn't fuse at the ToP because he didn't want to, not because he didn't actually learn how until the Broli movie.
But perhaps Jiren in general was referring to fusion in general, e.g. like what happened w/ Kefla?

Or perhaps, CC Goku & Vegeta experienced the events of M12, when they fused to fight against Janemba. I don't think this possibility could be ruled out either, since we know movie villains exist in this world like Cooler.