Instead of arguing, why not play a few test matches? Here goes:
Kabaji (xx) ALL BASED ON FAYTES LIST
-Power[Feat]: User gets boosted 3 points.
-Usu[Feat]: If Kabaji plays singles, he becomes the base level and copies the [Effect]
or [Aura] of whoever he plays.
Lets say...Hiyoshi
Kabaji goes to 15 and extra 3 gives him 18 v Hiyoshi's 15. Gekokujou is useless but Hiyoshi goes up to 17 anyways. 18v17. Only useful technique Atobe has is World of ice, so they both drop 5 points. Hiyoshi loses by a point.
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Kabajii v Shinji
Kabajii goes to 12.5+3, making it 15.5. Shinji on the other hand is 12.5. Kabaji copies Spot, so it's 7.5 for Shinji. Kabajii however, drops 8 points because of Spot AND Mumble, so it's 7.5 v 7.5. Draw!
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Kabaji v Inui
Kabaji goes to 19 points. Inui gets boosted to 22. Only good effect there is waterfall. so -2 for both of them. 17 v 20, Inui wins!
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Kabaji v Kaidoh
Kabaji goes to 19.5 v Kaidoh's 16.5. So since opponent is now stronger, Kaidoh goes to 21.5. Say they both copy Dunk Smash, down three for both. Kaidoh wins. If Devil mode is not activated, then Kabaji wins.
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Oshitari would lose against Kabaji - however Jirou would beat Kabaji since he has flexible wrist. Against Gin, it would be a draw since they both have power and their effects are hadoukyuu.
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Kabaji could beat Kite IF he had HItman activated - since Kabaji would copy the effect of Kite and the effect is if opponent has an effect, kite is boosted 6.5, Kabaji would win.
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Kabaji would lose against Sengoku - Kabaji boosted to 22, Sengoku 19. Since Kabaji's final number is now even, Sengoku boosted 5 points. Lucky is useless since both of them used it and nulified each others effects.
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V Kirihara
Kabaji is 26 v Kiriharas 23. Kirihara boosted to 28 due to Devil Mode. Nothing matters now. Kirihara killed Kabaji.
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Kabaji would lose against Chitose. Tachibana just about pulls through. Akutsu would DRAW to Kabaji. Fuji would win. Renji also pulls through. Hear this - Atobe would draw to Kabaji! Tezuka would also draw to Kabaji! Even Sanada would draw to Kabaji! Thankfully, Yuki would pwn Kabaji. I think Kabaji would draw to Echizen too! Kabaji would beat Ryoga too...
Fayte, Comet of destruction needs to be on your list too

...otherwise Tezuka would still lose to Atobe...