So far I agree... we should be able to sex your barred birds in a week or two, given the barring on the wing feathers. The ones with white or pink legs are marans, the ones with yellow are barred rocks.
For your SS... I agree with @Crazy for Chickens! Its not a SS. My hatchery SS had whitish pink legs from the start. Also, my SS was chipmunk striped, as below.