Could you post more pictures of the second chick? To me, it looks like a Silver Laced Wyandotte. I agree that all of the others are EE's. They are pretty chicks! Do you know if they are pullets?
I also think chick 2 is SLW but it's hard to tell without a frontal shot. The others all appear to have beards which screams EE but not seeing it on #2.
Is that 3 separate birds? If so, you have 2 definite EEs (1 and 4), but the darker one does have similar marking of an SLW and the other with the stipe on the eye, could be a Hamburg if you got the Rainbow Layers. If it isn't a Hamburg, it is probably an EE.