the second one in line is a roo you can tell my the color and the size of the comb already.
Barred rock roos and more white then grey and the females are usually more gray then white good luck
oh wait lol I have more
the 5th to last one has really Big legs! with might be a sign of roo
the tird one looks like it kinda has a pretty red comb already.. they dont look that old, how old are they?