ok, enough with omega 56 year old GJ and 36 year old YG.
lets look at them in their 20.
ZWJ managed to defeat every sect at the Ming's Peak, and he was about 20 or 21 year old.
Could GJ at the end of LOCH being also 20 succeed?
Could YG after he mastered the Heavy Iron Sword being around 19 or 20, not sure, can also succeed?
Althought their internal energy is insufficient compare to ZWJ at that time, I believe they would be able to defeat them.
My only doubt is how GJ is going to handle the Heaven Sword of MJ, knowing him he would use his bare hand. While YG could just over power MJ's heaven sword with his Iron Heavy Sword.
Do include all the other fighters that ZWJ encounter on the Ming's peak.