In 4 years he turned his entire 4 man staff over twice and none moved into head coaching positions. If you get to hand pick your assistants and you still can't keep them happy something is wrong with the atmosphere.
Two went on to HCing positions and all the rest got substantial job upgrades and/or pay raises. The last round of turnovers can also be attributed to CSG's probable lame duck status. You can't put the turnover all on CSG. Even JJ said as much.