Funnily enough, Jack Cleavers are actually better for Chainsaws; they offer one more point of Damage, and when facing towards Duct Tape, will affect it in the exact same way as King Cleavers. Also, they're cheaper.
Good point but I got 4 of my King cleavers and 2 hats through a spin the wheel. Isn't King better since it sets off the king next to it as well as the duct tape? The key to the build is that it triggers the Rage of the main cleaver because it's used more. On the current save. I have 10 rage on the main cleaver and its triggered 11 times per energy. after one attack the main cleaver does 2144 damage base.
I actually spent the past few days testing this out, and I've figured out how Chainsaws work, on a technical level. Essentially, to prevent Duct Taped Cleavers from infinitely proccing each other, each Cleaver can be used multiple times per round, but is only actually allowed to activate each other Cleaver once in a given round. That means that if Cleaver A activates Cleaver B at its side, then Cleaver A can't also activate Cleaver B through Duct Tape.