Nagato
Paraphrasing what I said in the last topic: I disagree with the notion that Nagato can just instal-seal/steal Goku's Ki, given what we see of other fighters in DBZ (most notable example? Candy Vegitto). Ultimately, I think it'll boil down to strategy and tactics, and even with Goku's combat-focused mind, he doesn't hold a candle to Nagato's brainpower.
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There never was a post. Swamp gas from a weather balloon was trapped in a thermal pocket and refracted the light from Venus.