I think he has both, light sussex and rir.... But he is not sure what the eggs are from.
I thought the black feathers on the neck might be clue to someone ?
Any ideas about the sex ? .. Comb looks large but I don,t see any tail feathers, ,it's not crowing but feet look big ... So I all confused ?
It is difficult to identify what went into making a mixed chicken. That is why it helps to narrow the possibilities by identifying the breeds your friend has.
I think at least one parent was a Rhode Island Red, or something similar.
Does your friend have both Light Sussex and Rhode Island Red roosters?