And going beyond vague words like 'omnipotent,' we have feats like time travel, undoing the destruction of a galaxy, and dealing with the Counteractor, a being that the cousin couldn't manage without risking destruction of the universe.
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as much as I like Goku (and I have sadly not yet seen SSG form in action), Kami Tenchi is many orders of magnitude beyond SSG Goku in power. Goku loses.
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Kind of close, but Goku wins this, because no matter how you look at it Bills can destroy entire universes instantly just by getting angry, and Goku was about equal to his 70% power. Kami Tenchi is not omnipotent. Where has it ever been said that he is? Just saying he has infinite power means nothing, shit, even Nappa was thought to be invincible when he first appeard, and even a god thought Frieza was unbeatable. We have to go by power scaling or feats, not just assumption. Some statements might be accurate, but they would have to be from someone who can accurately gauge power or abilities.
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First of all where are you getting the universe buster claim from? IIRC they said galaxy in the film.
Feats?
2 LHWs is enough to destroy a universe, and normal Tenchi has up to 6, Chosins can form 10 and are Multiversal, and Kami Tenchi is above them.
Thats already the destruction done, vastly in his favour.
1000 times FTL for Tenchi, 100 quintillion times FTL for Chosin (Galactic sized, punches covers over 100,000 lightyears in seconds), and again Kami Tenchi is above them.
Speed, so easily his.
Anything else needed?
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A 2nd gen or a particularly strong 3rd gen tree can manage 2-3 wings.
Zinv is the counterpart to the Idol, and the Idol is the seed of a 1st gen. 1st gens have power for a lot more than 3.
Also, it wasn't Zinv directly/alone, it's just that regular travel between the two worlds was gradually causing them to collapse into each other, as a result of Zinv. Zinv was tied to it, but it's not like it could just purposefully do so.
Not all things with the same number of wings have the same abilities, as well. Tenchi when he only had three wings could do matter transfiguration, while Z with 5 couldn't. All wings provide the hax, no-limits, 'any energy that hits it regardless of amount gets transmuted to harmless form,' defense in 11-dimensions, but usage of wings beyond that vary.
The thing is, Toriyama is pretty vague on feats of the Z god hierarchy (I'm thinking on purpose).
There's been some talk of the Kaio-Shin's actually giving the Nameks the ability to create Dragon Balls (The elder Kaio Shin that powered up Gohan chastised the younger for allowing them that ability), and other talk of universal level manipulation, but not much actually shown.
The Dragon has better feats compared to them, and it's been destroyed pretty casually in the past..
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Eh? Even Bills admitted Whis is stronger than him. Also, going by your logic, Bills hasn't done the destruction you claim him to be capable of since we have no feats of him doing so.