In that 3rd picture down, you have at least a couple of males. Those look like black sex link males or other Barred Rock crosses. They're not pure BRs, but the two on the left in the 3rd photo are cockerels and the one on the top in the last pic is a cockerel, too. Definitely not pure BRs.
Yes, pullets do flare up at each other and at the males, too, so you can't go by behavior at that age. I've had several BR crosses (accidents) of Silver Phoenix males over BR hens and they were quite similar to yours. The pink comb by 3 weeks old and the "ghosty" barring was quite a giveaway that they were not just BR pullets, but BR cross males.
ETA: Be really super careful buying birds at livestock auctions. You may be buying a boatload of disease trouble.
Edited by speckledhen - 5/5/12 at 5:41am