Silkies carry the rose comb gene; many also carry the pea comb gene. This particular bird does not, it could have lot it in the cross (indicating that the silkie parent either did not carry pea, or only had one copy, and did not pass that one on. This does not look like the ones I have had that had the sort of split single comb.
I believe this bird probably carries a copy of rose comb gene, and possibly a copy of buttercup.