It's interesting to think that it wasn't that long ago that K wouldn't let a player wear #1 because of some strange idea that it somehow put that player above the rest of the team. I like, as a fan, tracing the lineage of a jersey number and thinking of all the great players that have worn it. For instance, Matthew Hurt is choosing an iconic Duke jersey number as well that is attached to memories of some fantastic senior leaders. Cassius Stanley will wear the jersey number attached to such greats as Luol Deng, Nolan Smith, and Quinn Cook.
Zion was amazing, as was Jabari and Kyrie who also wore #1, but to have that jersey retired the player needs to have a 3 or 4 year career.