Honestly, DC's hierarchy in general is just completely out of whack. Like based on everything he does and says, I would believe that Didio is the EIC, since his role is very similar to how Cebulski handles things over at Marvel. But apparently he's not, he's the "Co-Publisher" and Harras is the EIC, even though I rarely ever hear about what he actually does for the company/books.
Also, if it turns out that it was Harras' doing and Didio disagreed with it, wouldn't have Didio have been able to overrule him since he technically outranks him? I'm probably missing something and its not that easy, just goes with the question of how DC's executive lineup works.
Like someone mentioned, the Under The Moon Catwoman had like 10 different executives listed, just showing how overprotective and overcompensating they're trying to be.