Wow, that is a huge difference in the comb, and the multiple thicker white bars throughout the wing. As of today, day 28, I don't have any big difference between the BR combs and it does seem like Late Bloomer is beginning to speckle out more as the days go by.
Thank you so much for posting the pictures of your chicks, beautiful and very helpful!
Late Bloomer, Day 28
Other BR chick, day 28
Together, day 28 (also fun because everyone paired up by the other speckled sussex)
I am 99% sure that your late bloomer is a pullet! I'm glad I could help you. Also another difference between mine is my cockerel is developing waddles and my Pullet has yet to start getting hers in !