This will be a phenomenal chopping test. Great stuff you have!
The Ka-Bar is likely the weakest, but we will see. The RAT-7 and BK-7 are known to be good choppers. The Gryphon has a great handle and is AUS-8 steel. Just hefting them today, the Guard has a much heavier and thicker blade than the others. I think the YG will probably kick some butt.