It could be a reasonably strong squad if that happens. Personally, I think Tom H should be playing, but as you said Smallwood has been very good recently.
Moncur hasn't had much of a look-in recently and is falling out of favour or doesn't fit the current formation.
I like Moncur and think he's a tidy player but don't fix what isn't broken. Moncur doesn't get ahead of Honeyman in the number 10 role and I wouldn't trust him in either one of the wing-back roles. I thought Longman and KLP would struggle at wing-back but they're doing well there which is a nice surprise. Williams is the obvious choice to come in for KLP or Longman in this 3-5-2 if necessary.