Battle takes Place in outerspace.We know Odin is probably the most powerful skyfather,and in Asgard he allowed Thanos to up his power to his max and Odin could still beat this.However in space,Thanos I think could draw upon enough cosmic energy to match Zeus that this would be a draw and be the most even battle of cosmics in the universe.If their was a more even match up i would like to here it between cosmics?
At this point, Thanos could probably beat both Zeus, and Odin together. Last I saw, he was able to call on all of the dead to fight with him. Thanos has become more powerful according to his last showing.
Even if Thanos didn't call the dead he'd defeat Zeus based on feats alone. It also doesn't really depend on how strong the dead are since he can call on any within Death's realm, which should include the likes of guys as powerful as Korvac.
Thanos has gotten an upgrade. It was stated that he was going to become more powerful than Odin and Zeus, and rival Galactus in power. He's shown a new ability in case you missed it? If you recall, he recently called the dead to fight for him under his own power. Besides, what has Zeus done of note? He actually has to prove that he's on Odin's level, Thanos has proven that he can take what Odin dishes, and continue to rise to his feet. That of course was a weaker Thanos. Zeus gets slaughtered.
Oh and Carver, I'm not sure if you noticed, but I believe that Thanos wiped out the Annihilation Wave all by himself. Zeus would have been completely overwhelmed. Thanos also tanked a blast capable of blowing Thor to bits which only left his arm lying there as a reminder of just how powerful the blast actually was. Thanos stood there like a gangster sporting damage that appeared to be as bad as the damage that Odin put on him when he was weaker than he is now. Just something to think about.
Lol carver tried to claim Hulk survived Annihilus planet blasts, despite Annihilus watching saying everyone was dead barring Thanos and Thanos claiming it himself.
Seeing as he hasn't close to odin's apperances, statements about them hold,none of his feats berate statements of them being equal,and iirc, both have scruffled briefly before