Love it! I look forward to seeing the posts! I did that with a fall hatch of mine, trying to figure out which were pullets and which were cockerels. The girls from that hatch are just starting to lay, which is exciting too. One I gave away lays a pretty cream colored egg, the two I kept lay pinky buff colored eggs. The funny thing is the big pullet ( I think she is a GDL X BO cross, think really big and fluffy) has been laying almost every day since she started on the 5th but the eggs are smaller than PeeWee, the other one that was the slowest maturing and smallest of the lot (she looked a lot like your 4th chick shown, all black as a chick) lays a huge egg for a pullet but I've only gotten two so far (started laying on the 8th). I had set 7, 6 hatched, 3/3 pullet to cockerel ratio. I had to cull the cockerels. So sad I couldn't find them homes in time.
I've never seen a five toed chick before. That's pretty freaky! Any idea what the parental gene pool consisted of?