Definite male, if one goes by the feathering alone. There's a chance it's a female who has very imbalanced hormones. Some hens develop male feathering and behavior as a result of that. Some develop the behavior while looking (and laying) like normal hens though, too.
I think it might just be "acting the girl" because it's possibly not quite right development wise.
His body language is pretty feminine and his crest and wattle development quite unremarkable for a male, even females on average have better development and coloration when healthy. His feathering is typical for a male. But something isn't functioning as it's supposed to, it seems. Does he mate with hens?
I had one rooster who only crowed three or four times in his whole life, long past his first birthday, because he was in a bad way from a young age. The only time he crowed was on one day when I'd locked all the other boys away and left him out with some hens. He mated normally the rest of the time but didn't offer the vocal challenge the other boys do as a habit. He was fertile though. He also had very tiny crest and wattles, but larger and redder than your boy, even when he was very ill.
If you observe this one more closely you should be able to find out whether it acts like a male, female, or juvenile, and whether it's mating or not. At its stage of development it should be mating, crowing, and generally acting like an obvious rooster. Though obviously this isn't happening.
Best wishes with it.