I always wondered how far behind the Greats Huang Rong was. Now I think I have the answer. In ROCH chapter 31, it was said that Huang Rong's internal energy abundance is inferior to Wu Santong's. This would put Huang Rong so far behind the Greats that she could be smashed into pieces by her husband in one stance.
Remember: Wu Santong < Zhu Ziliu < Ma Yu < Xiaoxiang Zi in martial arts. Now we know that Huang Rong < Wu Santong < Zhu Ziliu < Ma Yu < Xiaoxiang Zi, in terms of internal energy.
Of course, her technique is much better than her internal energy level, so in the end she'd bump up a level. But it's still not enough to come close to Great-level. Just look at how she lost to Post-16 years Golden Wheel Monk in one stance.