Goku can and has brought things back from the dead.
And technically Goku could just teleport out of the Vault, have Vegeta get teleported, teleport back in, and keep repeating that system.
That is, if they don't just kill Atheon before he can even teleport them.
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It's a timegate so the question is time-travel?
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In the buu saga buu was able to get out of the hyperbolic time chamber which is a different dimension than earth by just screaming loudly. So did gotenks so why not goku?