I dont see any of the masters dying because that would ruin the storyline seeing as they still have to teach Kenichi but losing ofcourse. I believe in Master vs Master fight its all about the match of style than it is about overall power. I can see a Master getting into a fight where their style is a bad match when going up against Another Master. I could see somebody like Isshinsai Ogata with Seidou Goui giving Apachai a hard time. Technique vs Technique more than Power vs Power I could one losing.