I know this game needed a new tank, but somehow I just don't think Dark Knight is really a fitting choice. We're talking about a job which historically sacrifices HP to deal bonus damage and relies on supplemental black magic. They've ALWAYS been weak as all hell too, taking hits about as well as a newborn. Goodbye Dark Knight, it was nice knowing you.
Still, it's not the first iconic class to be turned inside out in FFXIV. Black Mage was first, after all. I still held hopes for a different option for tanking though. Runic Fencer from XI perhaps might've been a better option.