Player dev changes were near the end. Menzin and Sartori were promoted to AGM his final year. The performance science department was created 2020, I believe. (I remember being really excited about that hire only for it to be rendered moot by the cancelled season)
But it is an undeniable fact that the analytics staff growth was mostly early in his stint if not steady throughout. There was no analytics department in 2015 (Menzin and Smith were both doing it part time). Sartori was hired in late 2015 as well as a few interns and part timers, and the staff grew to its current size roughly 2018 or so.
Harris did expand things further his first offseason, and I expect the standard second offseason overhaul as more of "his guys" are available.