The traveler would prevent that. Like he prevents the darkness from engulfing everything for the last few centuries. It would also take goku years to acquire that power because he wouldn't know how to cheese the raids to hit lv 40.
[spoiler]gotta use non-logic to fight stupid theories[/spoiler]
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Spirit bomb...?
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The only thing the traveler has prevented was one small city from falling lol, wtf are you smoking