My understanding is that Sizzles are an unofficial crossbreed of frizzled Cochin to Silkie. They are not a true breed because two Sizzles bred together do not breed true. The only way to get the desired characteristics is to cross breeds. Sizzles can be either smooth or frizzled.
I have bred first generation with good results but breeding Sizzle to Sizzle resulted in a mess of traits so I never did it again. In fact, I decided not to breed Sizzles anymore and stick to Silkies.
This may be the way I'm leaning now also. Love my cochins too, maybe I should just develop them separately.
I'm talking about true multi-generational Sizzles. These will breed true and are like Silkies in all aspects except feather type. My local breeder has Sizzles on their 18th or 19th generation and many are show quality. All Sizzles originate in Cochin crosses but it takes several generations to create anything close to a real Sizzle.
Thanks for the input! Pretty much exactly what I needed to know!