Right now my guesses are: 1 splash, 1 cuckoo, 1 black (or black copper if "breeder" included a different variation, just as with the cuckoo-which looks like might end up a blue cuckoo

), 1 blue, and the last little one could go blue or black as of rn. Although when stretching out it's wings, looks to be more gray in there than the darker outer ones).
Now as to cockerels vs pullets...??? I'm pretty sure the black (w/white wing tips as of rn) is a male. Carries himself as such & has plenty of energy & confidence, despite little comb growth, but I'm guessing that it just because he's only about 13-15 days old. I'm also pretty sure I saw a a bit of red-ish colored hue on those shoulders today.

Clean legs, not showing any feathering.
I'm assuming the cuckoo is the oldest, as it has always been the largest & already had 2 rows of wing feathers when we got them on 3/01. Comb is growing in more than in the others (no pink or red) & it's also the only one with pin feathers in the tail already, but I'm assuming it's because it's older. Thought it might be a cockerel, but maybe not based on behavior and the fact that 2 others are almost catching up size-wise. Or it may very well be wishful thinking as this little one is REALLY growing to be my favorite & I have no need for 2 cockerels. Willing to keep more than one initially & let them grow out, but in the end, will only be able to keep one as I do not have enough ladies for more than one rooster.
The splash chick started out as my fave, but cuckoo one quickly catching up to this one. Still think it's going to be gorgeous & looking forward to keeping this one regardless of gender! I initially thought this was a cockerel, but will be thrilled to have it be a pullet, since am nervous about how many males I may have out there. Regardless, unless it turns into a mean or aggressive rooster at some point, this one stays regardless of gender.
Splash one seems to be same age as the black one & they have feathered out wings together. Neither has any tail to speak of. Definitely much more laid back & easy going than the black rn. Calm, shy, less energetic & sticks pretty close to Mama. Again, thinking about 2 weeks old.
The last two are the youngest & the smallest. One blue for sure. And the other one could go black or blue as of rn. One day out of the incubator when we got them so makes them 11-12 days old now. The one I'm pretty sure will be blue also seems to be showing cockrel stance & confidence.

Or maybe I'm just paranoid! These two have the most "fuzz" on their legs & outside toe.
The little black/blue does have alot of gray after the 1st row of feathers when it stretches those little wings out, unlike the bigger black one. Plus it's black is looking more dark charcoal vs the jet black of the older one.
This little one is the only one I'm willing to step out on a limb about and say MAY be a pullet. But this baby only 11-12 days old, so should probably take that with a grain of salt.
Running into issues with pics rn, so promise I'll post some tomorrow!