Gotta love it.
At some point in the next few months, he'll presumably become the first NBA owner [that I know of, anyway], let alone head coach, to get his number retired by the team that he played for afterwards.
I know that Magic Johnson's number was retired in LA in 1992, which was before he became head coach/owner in 1994. Jordan and Bird wound up executives with other teams. Is there anyone in history who has achieved the feat which Jason Kidd will?