The black chick with head spot IS male. If he has some of the red come through, he's going to be gorgeous.
I don't know if the standards for bantam are the same as for LF sussex, but if you're trying for breed standards, you're going to have to do a lot of test breeding to see if yellow legs...
From everything I've seen on leg color, it's a bit wonky. Unexpected colors can crop up from time to time. I did run the sussex roo x Dominique hen combo through a genetics calculator just to see if it popped anything surprising. Mottling (including mille-fleur) is recessive, so any babies from...