CX to CX always gave me all white chicks...
I saw yours and would have said something, but there are so many varieties of CX it is hard to say (impossible for me) they would all give you all white chicks..
The other thing I noticed were the legs. they seem spindly for a CX to Cx. The ones I got had OAK tree sized legs.
I would lean towards a cross, BUT still a good start. Bring them back to CX next generation.
Make sure you know who is mating with who, that becomes kind of important in making a meat bird.. BTW I am getting 8 eggs a day from my 10 Toad hens! I am happy,,