Worked out okay for Garza and the Murrays and there are several other guys that have made a pretty good living playing basketball.
Say what you want about Fran but he does do a nice job getting more out of guys that he has any right to. The problem becomes that it greatly limits your ceiling when you are relying on developmental kids.
Disagree a bit based on the 'how'.
All 3 of those guys did a ton of work OUTSIDE of Iowa City to improve their games, iirc. Fran didn't teach them much if anything on offense, and certainly NOTHING on defense.
What Fran does do, imo, is gives guys an open system to showcase their scoring ability. So that lets them be a bit flashy and put up numbers and get attention. Esp guys that are marginal physically like White, Garza, JorBo, get to put up flashy numbers in that system.