I'm fascinated with stats when it comes to lots of sports, especially Horse Racing and Snooker, but boxing stats are virtually pointless because fighters basically only ever meet once and comparable form is very sparse.

You match a fighter with a 100% KO ratio against one with 0%. They've never fought the same opposition. They share zero collateral form. How can we possibly be certain the fighter with a 100% KO record is the harder pucher? The 0% fighter could have fought a bunch of iron jaws, or simply mixed at a much higher level. That's boxing.