So I had to catch them all to cut their crest because I had another one that went completely blind. 2 of them were blind and they were all pullets (number 1 and 3). The only one that had the eyes free from the crest feathers is probably a male (number 2): his crest was straighter, more upwards, and I can see a little bit of red on his comb.
Sadly I didn't take pictures because I was already struggling doing an hairstyle to basically feral birds.