Now, we agree that XF would take a few strokes (>3 is consensus) to defeat MRF. He was only able to do it in one stroke, because MRF was distracted about killing DY.
We agree that Xuan monk>MRF.
In Ju Xuan Manor fight, XF was about to suicide when 10+ people attacked him to prevent him from doing so. Somehow he manage to come out of that with a Xuan monk completely immobilised in one hand, without being injured at all. That was after he was previously injured in 3 sites and taking care of Ah Zhu with his left hand.