I agree. I don't even have full bt kakuzu, and only got his mys and super armor passive y+2. I still destroy non edo minato bt teams and six paths. Honestly, kakuzu is a lot more versatile. Kushina isn't really a support, but can be ran p2 with res def passive quite annoying indeed. with all these akaktsuki memebers, kakuzu can give them a double standard, and does decent damage chakra or not. People with sasuke rinne sharingan, and kakuzu will be deadly in arena indeed. Using kakuzu as a p1 is also cool, but he has so many counters, like summer kurenai, edo madara, since he steals chakra, kurenai limits chakra which is also very annoying. If you can read your opponent, you win. but with people with immobile mysteries, round 1 like summer kurenai, anbu yamato, they're hard to interrupt and can * you up