I don't know much about RIR's and how they grow up and feather out but #4 does not looks like a RIR with that patterning! and same with #2 since it has white? #3 is not a RIR but perhaps could be a Rhode island white?
It does look like you have a white frizzle and white silkie for sure, thats good <3
As far as genders, silkies take a bit lonfer but I put my vote in the dude catergory. Out of the 4 silkies I hatched a few weeks ago, the smaller crested ones are dudes.
The frizzle looks pretty pullety from this angle, same with what I assumed to be a RIW, and the First RIR. The second RIR and the patterned one have suspicously large combs for that young age.