It's an interesting subject though, someone like Chuck who KO'ed more guys than most, doesn't put that much energy into his shots, he's certainly not the hardest hitting guy in MMA but he got precision - and that's why he scores so many KO's.
Where as someone like Burkeman, swings like hell and put everything he got into each shot, problem is he's too slow, they can be spotted from a mile and he ends up hitting the air... and draining himself of energy in the process.
Even at the top level of the fighting game some fighters doesn't realize this and train accordingly which is pretty stupid.