Your going to get mostly red offspring. Some will get some white mottling but the majority will be red, I doubt you get very many "if any" millie fleurs. The millie fleur pattern is very hard to breed. I myself have been breeding millie fleur Cochin bantams for 7 years and my breeding stock that I've saved back over the years is show quality. But I hatch over 50 chicks a year and only about 20%-25% end up being millie fleur. I get a mostly reds, buffs, and a lot buff mottled. I sold out last year though to concentrate on my Columbians.
If a person was just looking to hatch some pretty Cochins they'd likely buy eggs. But if a person was breeding millie fleur Cochins, or frizzled millie fleur Cochins they likely wouldn't but eggs from this pair.
If you do breed them and sell/hatch eggs. I recommend trimming the feather around their vents back very short. This will increase fertility. I do it with all my "fluffy" breeds as they have a hard time "hooking up" with all that fluff.