The LMSJ seem to be more powerful than the XL28P but I wouldn't say that XF's martial arts are overall less advanced and sophisticated than DY's as in addition to being a master of the XL28P and the Dog Beating Stick technique he is also an expert in Shaolin martial arts whereas DY only knows the Lingbo Weibu and the LMSJ. If the Dragon Palms don't work XF'd still have plenty more alternatives to beat DY, but in the case of DY, if the LMSJ are neutralized, which is very possible given XF's combat experience and DY's tendency to choke at crucial moments, he'd be toast b/c his close-quarters fighting skills are basically equal to zero, and he can't dodge forever even with the LBWB. XF may not be able to overcome the huge internal energy gap to beat XZ as XZ himself is also a fast learner of martial arts but it's highly unlikely that he'd lose to a pansy like DY.