I never could judge using the comb as an identifier... I have decided that I have a naked neck roo... pretty much the same color as yours with a really auburn top knot on his head (thus the name Carrot Top or Rotty) I came to the onclusion of his being a roo due to his being more stockily built then the others and also having searched liked crazy for indicators the really red face seemed to me the most prominate feature in all the neaked neck roo pictures I could find. Yours, like mine, has developed that very red face feature... Almost as if someone has dunked their heads in very hot scalding water up to the beaks Yes, this could be just waddle development but watch closely and I bet you will see that dark red spread past the waddles, further up the sides of his face. Yours already has a deep red patch up there by it's eye in the first pic.
I say roo!
ETA But I am no expert! I thought I would have a lighter colored Dominique hen and that would be kool but guess what? yup the sweetest roo ever!