Worst might be subjective, especially if the subject is g-league coaching
But the Spurs coaching staff has to be the least experienced bench of assistants in a long, long time since, well, the 19-20 Spurs I think had a combined 1 year front row experience, though Tim Duncan brought his own high level of game experience. I don't think Hammon even moved to the front row until 18-19, because at least on bkref it still shows Messina, Udoka and Borrego for the 2 years before.
That's a combined front row bench experience between her, Johnson, and Nielsen a combined total of 4 seasons of front row coaching experience coming into this season. More obviously if you want to count second row and intern experience but not much. It's not like they have a ton of coaching experience outside of the NBA either.
That is a shocking amount of inexperience. And it's been the trend since Messina and Udoka took off.
Even giving them their intern and second row years it's still the least experienced front row assistants in the league, and not just NBA experience, any coaching experience.
From perusing Basketball Reference many teams have 1 or more assistant that by themselves have more experience than the Spurs assistants combined, and usually also has years of head coaching experience on top of that in either the NBA, college, international or even high school. Nielsen spent 1 year coaching in Austin, Hammon and Johnson have no head coaching experience other than summer league stints.
The closest in terms of inexperience might be Boston, though I think there is a combined 7 years of college head coaching there.
Arguably the 13-14 Spurs were similarly lacking in experience with Bud and Brown taking head coaching jobs in the summer and Udoka only having 1 year of experience and Marks with 0 but Boylen had been coaching forever, over a decade in the NBA as an assistant and 4 years head coaching in college at Utah plus years as a college assistant.
Have the Spurs been well served by having such inexperience on the bench next to Pop?