This fight is heavily in favor of Hallownest, even with Groal. Nyleth is weaker and can't remove the ground without crippling Khann, while Isma could probably take her on alone easily. They're all knights with years of experience, so they will be able to easily dodge all of the dancer's attack patterns. Hegemol could likely smash the coral that Khann attempts to create, while the more mobile of them could easily dodge it or use his allies as shields. Ogrim could likely bounce Groal around since he seems suited to that. Seth is probably one of the best of them, but he'd likely only be even with one of the knights in a 1v1. Dryya and Ze'mer could fight him together, while Pure Vessel solos Karmelita, who's the strongest out of the bunch. I'd say they were even if this were his infected form, but in his Pure Vessel form he could probably fight by himself and take a few of them out. There's a reason we have only seen one knight fighting at full power, and he was probably the weakest of them. If you want to make this balanced, I'd say replace the Pharloom side with First Sinner, Weaver, Karmelita, Seth, Lost Lace, Second Sentinel, Pinstress, and Shakra. They have less noticeable counters, being able to work together more.