I agree with PJ
YTZ and MRF can't be compared to 2 Great. One lacked internal strenght and the other, techniques. While each one of the great have both internal strenght and techniques. So the combination of two Greats will be more internal strenght and techniques.
but comparing to YTZ and MRF to Huang Rung maybe is not a great comparison. Because in Condor Trilogy there is no one at their level, it is either to high or too low. I guess that is why they call HYS, Yi Deng, H7K, and OYF- the greats.