AFR misleading? Plugs tell a better story?

TT5.9mag said
The misfire at idle is making me wonder what is wrong with the wire or cap on number 3 cylinder. That plug looks enough different than the rest that I would focus on it.

Pictures of cap and rotor. Found rotor tip loose, able to go up about 1/16”. Rivet pulled out pretty easy with pocket knife. Don’t remember part number, it’s the extended tip from Napa. Street fire plug wires, checked #3 wire, exterior looks good, resistance is good. I’ve recently read not to run consecutive firing cylinder wires. I have 5 & 7 run side by side, will fix that.
Started leak down testing.