This theory is mostly about the project pefectheart's demise, and how I think it came to be. First of all, in perfectheart's demise, we see him suffering from a large injury. Now, this injury seems too big to be from a cat, and in chapter 91, in the end, cottonstar and houndflight found coyote markings, in the background it seems like a hornetstar shaped figure is watching behind them. I think that hornetstar leads pack of coyote to qindclan, river clan comes to help and perfectheart gets injured.
Credit for TOPH goes to @9rainbowtails
