actually when XYS fought with XF,could he had been fighting at not his best, so as not to injure his son,make him lose face and the most importantly to test where he stands? And when at shaolin temple, when MRB praised XF,could he had actually been better then XF because hes equalled with XYS. I think he also praised XF to help his son retain the pride of North QF and South MRF
I think they could be ranked like this:
XF:100%
JMZ:105%
MRF:45%
XYS:125%
MRB:135%