Usage of 'to not be' (They will be more likely to not be feminine?)

[K7]

can i say.. they will be more likely to not be feminine? why?

[Mister Micawber]

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It seems terribly awkward, even if the grammar works out. They will more likely not be female.
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Native English teacher at Mister Micawber's

[Belles1654]

I agree with Mister Micawber. If you say "They will be.." that is positive, and you don't need "to" I would say "They will more likely not be female." For some reason most likely sounds better to me than more likely, but I can't prove that it is more correct, so I haven't changed it. I'm sure you will receive more academic answers than mine:) -Belles