Mitchell wasn't the team PG in college. Snider was the PG typically bringing the ball up and running the offense.
Only time when Mitchell played PG full-time was when Snider missed six games due to injury in 2016-2017...Pitino misused Donovan, which is why who knows maybe Robert Williams will be much better than expected in a different system...
Also, Pitino played two non-shooting bigs and teams would clog the paint lol (Jaylen Johnson, Mangok Mathiang, Anas Mahmoud, Ray Spalding all awful shooters)...