Ok if he was in the Destiny universe why the heck would the Traveler give him ghost for? Goku is trying to kill the Traveler...You don't see cabal running around with ghosts do you?

The way I see it, Goku wouldn't be a "bad" guy more or less like a guardian considering that he aspires to do good. But in a PvP like setting he would eviscerate any guardian. The whole premise is that Goku would partake in the Destiny universe and be a part of it and so would obtain the base mechanics guardians have in the first place in order to set a middle ground. The debate here comes from whether other abilities such characters possess would outweighs another's.

Well the question is Goku vs The entire Destiny universe. If he's versing it that mean he's trying to destroy everything in sight/an enemy to everything. The question doesn't really make sense so it's kinda invalid anyway lol