I'm going to take an opposite PoV here for the sake of discussion and argue that the relief was entirely appropriate.
If the CO didn't leak the document, he certainly set conditions for it to be leaked. In doing so, he deliberately got out in front of the entire chain of command. He is not the CO of some backwoods reserve unit, he commands an aircraft carrier, probably one of the single biggest strategic assets on the U.S. shelf, and one deployed to an extremely sensitive area. By doing so, he broadcast readiness levels of a critical national platform, and clearly tries to put the chain of command into a corner with regards to options on deployment of such an asset to counter actions by regional pacing threats. I'm only guessing that the CO was hearing answers he didn't like, and decided to escalate. First off, the decision to ground such an asset is not his decision to make, and second of all, there is a reason we prioritize mission, then men and women, and then self. While he may of been putting his sailors over his career, was he putting his sailors over the mission?
Admiral Davidson probably didn't appreciate his decision cycle being influenced by a leaked Scribd memo for the North Koreans to read.
Just another way of looking at this - but my sense tells me that if you're going to mass distribute something like this, when you occupy a position as he did, it should come with a letter of resignation.