According to Deuce from Deuce & Mo, he heard Keegan grew an inch and added 4 inches to his vertical. Mentions this in the video from 2 days ago (Oct. 23) below.

Link - 2023-24 Sacramento Kings season preview with KingsFilmRoom and Jrue - 15:04

James Ham also frequently mentions that, according to the Kings medical staff, Keegan is a “late bloomer” physically which allows him to be able to add speed and muscle more easily.

This makes me believe in Keegan’s upside that much more especially with his most important skill - mental toughness.