That is the question.
In my opinionated guess, they should have the potential to do so.
Xuzhu- provided he would even use xl18z as his own to blend with his existing skills, can whooped Sm like Xf did. I am guessing that just the use of xiaoyaosg even without using the power of xl18z, he can match it up with Sm skillwise. ( in the older editions, it was further mentioned that Xl18z had shattered some of Sm's internals- bones and tendons)
Duan yu- even before he could get any closer for direct combat could fire off his 6msj as and when/where he wants it , could finished off Sm with a few hits or multiple hits at any one time.