So, why did Green opt for the change after his rookie year? The reasoning is pretty simple.
Houston's star guard wore No. 4 throughout his high school and G League career, but he was not able to don his traditional number as a rookie. The No. 4 jersey in Houston was held by former Rockets forward Danuel House, who decided against swapping numbers with Green.
The number has a significance to House, too. House is a native of Houston's Fourth Ward, and he sports an entertainment company called 4DHouse. It's unlikely House was going to give up his number for any player, let alone a rookie.