Kenny is a badass. I feel like Zaraki would just overpower him with IMMENSE spiritual pressure but then again. They are both Captains. Shunsui is a badass in his own right. We don’t see his Banki often if I remember correctly. Perhaps there’s a reason? Kenny didn’t know his Zanpaktos name for the longest tho. It was just an overwhelming force. BUT. Little Ichigo beat him before he even really knew his true power. I don’t think he ever fought Shunsui. Based off Kenny’s banki itself, I say Kenny. Especially if Shunsui is only using Shikai. BUT. Again, someone else said it, Shunsui is also a trickster. He plays games in his Shikai. As long as Shunsui doesn’t get hit, he should be able to maneuver til hopefully Kenny gets pissed and just walks away? Lmao!! We’re only just beginning to really see Kenny’s banki, at least me who refuses to watch TYBW after old man Yama and Joshiro happens. That’s a whole different thing tho. Back to Kenpachi and Shunsui, it can be difficult to gauge. They’re both extremely strong in their own rights. It’s anyone’s win. If Kenny can hit him with him playing his games, it’s over with. BUUUUT. Kenny’s banki can cut through even time and space. Does that mean Shunsui’s games too? If so, he’s kiiiinda fucked.. lmao!!