i see a lot of roosters as well. can you get full body shots from head to tail including feet it will be a lot easier to tell breed. as for gender the cockerels all have the long slender pointed hackles and saddles a good example is with your first one he looks like a white rock cockerel. i think i see some ee's and a black sex link as well but again full body shots will greatly help with that
I see a lot of cockerels too, first one I believe is a white leghorn roo, EE's ,Black Sexlink, cant really tell what the other ones are agreed with full body shots