Gender confused (Plymouth barred rock)

Can someone help me work out whether this chicken is a rooster or a hen? I know Plymouth barred rocks are sex linked and I deliberately picked out what I thought was roosters. This guy is roughly 13 weeks old, The brother was 2-4 weeks older and developed both saddle feathers and wattles at 13 weeks but the one pictured has not. He’s mostly white, with big yellow legs, like a rooster. But where’s the wattles? He also acts different, hangs around only people and doesn’t go back to the coop at night but heads towards the house. “Hes” confusing to me

Sorry for the bad pics.