Jeckle looks like half, half haha... But compared to Jack's larger wattles and redder, larger comb I'd say good chance a hen.
Be handy if you had 3 to compare! :p
Definitely looks like a boy and girl to me! Did you wind up with anymore cocks out of your other chicks? Apart from the JG above and the other black one that was up front in your original pic?
I reckon there is only the one rooster out of the three. The second chick's comb is a bit questionable but I think it's just because it has so much more yellow and white on its face.
I thought that all hatchmates are nice to each other... That is until I hatched 11 modern Game bantams and 2 started a fight that went all day at 5 days old! It involved 1 grey rooster chick, 3 black chicks (one rooster), paranoia, confusion and a lot of cheeping... The poor grey one couldn't...