Irsay had Tony Dungy as head coach for 7 years, the longest period to coach for Irsay, so i doubt Irsay has issues with race.
On an individual basis I don’t know what drives owners to make coaching selections. I suspect it varies widely. Sean McVay was a mystery hire from nowhere and he won a super bowl. Go figure.
But no one is going to interview mid season, especially to get those under contract to potential super bowl teams.
In Saturday’s case I suspect Irsay has a special fondness for him given his history with the Colts and may be enticing him into the coaching ranks.