He looks like he could be a non muffed/ bearded ee. Or he is just some random mix. Only way to know for sure is the breed him to a white egg laying hen and see what the pullets from that cross lay.
Sounds like a plan! I love him either way. Ee or mixed. He isn't aggressive. Doesn't over mate the hens. And of course a good protector. I'll set some eggs to see what hatches lol.