Prove me wrong. I'm a lore expert on Destiny, so odds are I can refute any argument you provide that favors Destiny. Vegeta and Goku would beat the entire Destiny universe in a fight.
Lets also assume they know the mechanics for the VoG and Crota's End.
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On another note, the vault of Glass cannot be two manned. Both of them would be lost in time, which wouldn't be a problem as they've covered time travel before, but, assuming that, they have no means to escape the new timeline and would effectively be dead.