You guys are making some good points, but I dunno. After seeing how much Marvel has tried to downplay the Asgardians' connection with the Norse gods (they're just aliens! Magic is science!), I can't imagine them not doing the same with the Olympians. And the easiest way to accomplish that, at least in my opinion, would be to merge them with the Eternals.
They don't even have to use all of them, just the most popular (that means Hercules and Ares). No one cares about the other ones or about how much they differ from their Eternals "counterparts". Like, I really doubt anyone but the most hardcore fans would complain if Thena and Athena were fused into one character.
According to Wikipedia (again, I know next to nothing about the Eternals), Zuras is the son of Kronos. Kronos is Zeus' father in the Greek mythology. Come ooooooon, man. Was Kirby trying to drive his readers mad?