No crowing or saddle feathers - yet. The comb and wattle size has tripled within 2.5 weeks.
That sounds about right for a pullet about ready to lay. If that's what "she" is, then you should get eggs within a few weeks.
But you're right that it could also be a late-blooming cockerel, and I don't have any good ways to tell them apart except to keep waiting. (Well, DNA sex testing exists--pull a few feathers and send them off to a lab, along with some money, and get results in a week or two. But its usually easier to just keep waiting until the matter finally becomes clear.)
It isn’t the top hen or even the second hen in terms of pecking order. Its very protective against hawks and leads all the other hens into the coop while it stays out to watch for awhile. Today that happened and when he/she went back in the coop it brought a piece of corn and set it on the ground as a treat for them! When free ranging, it also gives that rooster call when it finds food - all the others come running to eat.
Is this something that hens often do too?
Good observations about the behavior, but I'm afraid I don't really know the answer.
Broody hens certainly do some of those things for their chicks, but I'm not sure about non-broody ones.