1 big reason I am reluctant to place YG far ahead of GWM is that would it would mean YG is FARRR ahead of the original Greats.
Given his exchange with HYS/ZBT (albeit not life and death battle), are we ready to give YG that benefit of the doubt? GJ is only slightly ahead of the Greats (pre-16), does that mean YG is also far ahead of GJ? (the audacity!)
He is already 5 LV ahead of the Greats at this ranking (the same diff as LOCH GJ vs LOCH Great), which I think significant enough. It would be more "reasonable" to attribute the final battle to GWM underperforming/taken by surprise/YG's extreme despair state, rather than YG being far ahead of GWM.