Yeah, He's definitely got a lot of Brahma in him, but he's not pure Brahma, not with that comb. His stance is really nice though. I wouldn't cross him to any of those pullets. Lord knows what he's carrying genetically, You'd be doing the breeders that produced those lovely ladies an injustice if you indiscriminately crossed a mix onto them. You'll lose the pattern feathers and a lot of the colors. If you're just wanting Brahma mixes to lay eggs, I suppose that's fine, but if you want more attractive birds that look like the pullets, then you'll need to track down some pure cockerels of the correct variety.