Slow feathering question : 8 - 9 weeks old chicks

[chooki]

I have six 8-9 weeks old chicks. 4 of which I am pretty sure of the sex. There are 2 slow feathering birds, one seems to be a Ayam Cemani cross (the black chick), the other (orange brown) could be Rhode Island Red (possibly mutt). Both are just getting their fail feathers.

Are they pullets or late blooming boys? Is my suspicion of their breeds correct?

 

[GodLovesU]

It’s kind of hard to tell because they don’t have much of a comb or tailfeathers

 

[chooki]

I know right ..

For comparison, here are the rest of the chicks of the same batch.

 

[chooki]

I am fairly certain the grey one is a pullet, these are the picture taken 2 weeks ago:

I am still not sure about HunHun, the RIR (cross?)

Those are the picture taken today:

 

[chooki]

As you can calculate, they are about 3.5 months old now.

 

[chooki]

An update on them today:

Still not 100% sure of HunHun, although I am leaning towards pullet.
I have been adding 10%-20% milk powder to their diet to increase their feed protein level, got the milk powder on a discount because they were only a month to expiry.