
Originally Posted by
andomort
I would guess it was only allowed because they brought the item with them from before the tournament started. So we may actually not see other fusions, however I think Goku will be mastering UI, overcoming Jiren. There are 21 episodes left before the tournament ends, so much could happen.
I think we're going to see the entire Majinn buu saga in a few episodes basically.
Goku will power up to UI, put up a fight but jiren will just keep showing more and more strength ultimately kicking gokus ass. Vegita will have to figure ultra instinct out too because doing the fusion dance makes you weaker if you're both not at the same power level. Kale and califa had the ear rings which allowed them to avoid this, since califa was definitely way weaker than Kale.
Honestly this is what I think will happen. Jiren is going to start 1 shoting everyone across the map then Goku and Vegita are going to fuse somehow Jiren will lose. Then Goku will fight Vegita. Then goku wishes for all the universes to be returned, zenos or whatever that other guys face is will say no. Somehow zenos will get angry, goku will become god, then meet some higher dimensional god that's beyond zenos (since there are multiple zenos across multiple time lines I think this means there is an ultimate being that governs over all the possible time lines aka String theory)
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then we end up at the end of DBZ with Goku training uub to either become a god of destruction, or something higher. Unless he wipes everyone and his own memory of all the crazy shit we seen. Which is possible because goku might like the challenge after he becomes infinitely powerful.