The whole "limitless strength" deal didn't help Hulk against Zeus. Put a sufficiently strong enough opponent against Hulk, and he can be dropped before his rage amps him to the point of being able to win. I'd say a Guardian amped Prime fits that bill.
As for this thread, there's no reason Prime shouldn't be able to bust Onslaught's armor shell. The only question is whether or not Prime could handle a TP assault of Onslaught's reality warping (dude did create a sun out of nothing, IIRC).
Using Zeus as an example wasnt the perfect ploy imo. First thing, Prime is no Zeus, second, Hulk intentions was to get Zeus help, not kill him. Hulks body was lit in lightning when Zeus was punching him...then this doesn't include the fact that Zeus hit him with a humungous lightning bolt before the fight started.
Starscream is right, Prime powers doesn't grow exponentially while the fight drags and its not good to use Hulk as a scenario for Prime when we have no idea where Hulk was at power wise when he destroyed Onslaught.
Originally posted by Harbinger
Given the totality of Prime's feats, I don't think it's a stretch to suggest that at the very least, he's Zeus's peer in strength*. That was the only real point of my post, anyway.* Hell given Zeus's relative lack of feats, you can make a reasonable argument that Prime's more than simply a peer.
You probably could (which is doubtful since I wouldn't rank Prime on Odins level but I would put Zeus up there) but I just wanted to point out the plots of that fight and if I were to put Prime in Hulks place, the same thing would probably happen. Prime has never defeated someone on Zeus let alone Thanos level on panel unless I am missing something.