If it's all about executive management...

...this should concern primary voters:

Rather than punish Solis Doyle or raise questions about her fitness to lead, Clinton chose her to manage the presidential campaign for reasons that should now be obvious: above all, Clinton prizes loyalty and discipline, and Solis Doyle demonstrated both traits, if little else. This suggests to me that for all the emphasis Clinton has placed on executive leadership in this campaign, her own approach is a lot closer to the current president’s than her supporters might like to admit.

Rumsfeld was a bad defense secretary because he had bad ideas. Rumsfeld became a horrific disaster of a defense secretary because the president, prizing loyalty above competence, failed (for years) to send him packing when it became clear how bad those ideas were.