Doing Barred roo over solid hen does not make autosexing chicks. It has to be solid rooster over barred hen.
Pea combs, muffs and beard are dominant so all the chicks that have ameraucana in them would have all those traits.
It will be easy to spot pures. Biefelder x ameraucana would have a pea comb, muffs and beard which would be easy to spot.
The chicks have a 50% chance of being barred I believe.