Silkie chicks with straight comb? Are they pure? Missing Genetics?

[NinjaGamer2022]

A few months ago I got 6 Silkie chicks from Rural King (Hoover Hatchery). Today I noticed 2 of the 6 do not have walnut combs but I believe straight combs. I understand they are NOT show quality but are they also not a pure Silkie? Could they be rightfully bred as pet quality or should the 2 without walnut combs be used in barnyard mix hatching eggs when they are of age? Either way I love them but just curious if anyone has this answer. Thank you.

 

[JacinLarkwell]

Sometimes silkies pop up with straight combs. I wouldn't use them for anything but mixes

 

[MysteryChicken]

Sometimes silkies pop up with straight combs. I wouldn't use them for anything but mixes

They can be used for breeding pures. Just a recessive trait that can be bred out.
Gotten many pure walnut combs through Walnut X Single comb Silkie breedings.

Of course, occasionally you'll get modified pea combs, pea combs, or rose combs out of the Single X Walnut breedings, since walnut is made up of both Rose, & Pea comb.