Hmn. That is quite a conundrum. Judging by the comb color is hard, since it is fifteen weeks... I would observe. Those saddle feathers say boy, but I am just not sure. My rooster Elrond sits just like that, though, haha! I would watch for a crow at this point. 🤷
I would say it is a boy, as for the sweetness, I would keep hanging out and cuddling with him, but keep your fingers crossed. Roosters can be a mixed bag.