From my understanding Wyandottes are rose combed . Im not sure if there is a single combed Wyandotte out there. Hopefully someone will come by and help out. I have Wyandottes in the bator so I haven't owned any yet But he sure is pretty.
Wasn't aware there was a difference between rose and pea combed, I guess you're never too old to learn something new. We always just called 'em pea-combed.
So going by what your saying, they may not be pea combed at all, but rose combed, if you do not know the difference. If this is true then yes, you will likely end up with both rose comb and single comb in the flock, it happens in the Wyandottes and does not mean they are mixed.