1) Lorenzo is aptly named...."she" is a he and he may not develop spurs for quite some time.
2) Different breeds mature at different ages and there's variation amongst individual breeds. From your description of the red/brown pullets being POL (meaning Point of Lay...as in, old enough but may or may not have started yet) but having no combs, I'm wondering if they have beards and what color their legs are. These are two indications of them being Easter Egger pullets and because they are a mix of anything + having blue egg laying genes, their age of maturity is all over the spectrum. Could you please post pictures of them?
EDITED: I think I'm confused. Do you mean you ended up with nothing but white chickens even though 4 out of your 5 came from a red/brown pen? If that's the case...someone mixed them up where you got them from and kindly disregard what I said about the possibility of them being EE's.