I would say itās his way of showing off his love for her. Heās not the only player who has a sister. Heās not the only player who loves his sister. Heās not the only player close to his sister. Etc.
Iām too busy raising my own kids to follow every personal detail of other child millionaires. But I do remember when hazing and other initiation rituals were widely considered to be essential to instill team identity, chemistry, and a healthy respect for veteran leadership. Even after the NCAAās crack down on harsh hazing, I remember when all incoming freshmen still had their heads shaved. My point is, his is attention seeking behavior. You show your love for someone by how you act toward them in private, not by how you dress or carry yourself with your teammates in public. Hyper-individuality destroys the team, particularly when practiced by a newcomer. And effeminate, juvenile behavior undermines the strong, alpha-male energy needed to be dominant in a violent team sport.