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i suppose the most obvious evidence of goku becoming a god of destruction was one of the very first encounters we had with beerus. remember the conversation between him and the oracle fish? another god would appear and become beerus' rival. the identity of that god was later revealed as goku. as of right now we can hardly call what they have a rivalry. even their first major battle beerus was still barely trying. they are not rivals yet.
another piece of evidence is something that becomes more obvious over time. when goku first met beerus he didn't really understand beerus. goku immediately treated him as a potential rival. soon after getting his ass kicked, goku started to show more respect. over time, goku got used to this new stage and that initial respect started to slip more and more. goku is even training with whis, who trained beerus.
it's been hinted multiple times, even in the recent episode that it is possible for goku to eventually become a god of destruction.
lately goku seems to be acting strange/different from time to time. like he is carefully preparing for something big, or like he has found a new flame of desire. i don't think it's a coincidence that even after experiencing what zenchan can do, he still decides to interact with zenchan. they are even pretty much friends now. it's also not a coincidence that this means that beerus CAN'T kill goku, as he was originally planning to do in the recent episode.
the tournament of power is just about underway, and we know universes will be destroyed. this doesn't necessarily mean that new universes will replace the destroyed ones, but it does kinda make sense. what doesn't make sense is for the series to end and there only be one universe left, after the entire series is based on there being multiple universes. i think it is very likely that universes will be destroyed along with their kai/god of destruction, maybe their angel too. new god of destruction and kai will will be selected and new universes be born. the new gods of destruction can be selected from the winning fighters in the tournament of power. it may not go down exactly like this, but i'm pretty sure i'm on the right track. maybe goku will use the super dragon balls to wish to become god of destruction of a new universe.
i suppose we also need to account for the "rivalry" that will occur between beerus and goku. well i suppose that will happen sometime towards the end of the tournament, or after the tournament.
EDIT: i forgot to mention that ultimate gohan returning can also be a piece of evidence. i believe it was during the buu arc that gohan was originally supposed to defeat buu and become the new main character in the series. that changed obviously, but gohan regaining that power can be a sign of drastic change coming to the series.
also note that things are changing between goku and vegeta. not only that they are more familiar with each other than they ever have been, but that we are seeing more personal differences between them. it's almost like the goku and vegeta from the beginning of the cell arc have swapped places now. i am positive we will be seeing more of this.

any thoughts or opinions?
