Being an exec has NOTHING to do with leadership potential. My wife was an exec, and damn good, much better than the pilots (all top notch people) she was an exec with. Guess why? Because she had worked in college as a secretary.
An exec position is nothin more than a glorified secretary. Sure, you are asked the occasional input by your boss, but that could come from anyone else, you are just the easiest to ask.
In the end, being an exec, DS etc, is nothing more than a secretary job where you get the education of watching a dysfunctional bureaucratic organization like the USAF work its magic thanks to hardworking tactical operators and gobs of cash and resources.
If the USAF started promoting people it needed to be leaders instead of the bullied high schooler who finally got a taste of power in ROTC and learned if he kissed enough ass and filled squares he could someday be in charge.
We'd have less Chang's, less people making exec and worthless schools a goal and more warrior minded leaders who gave a shit about things other than their rise in the ranks of big blue.