It's castrum and praetorium.... who gives a damn?

It literally doesn't matter. Both tanks can be in tank stance, as WAR doesn't have Deliverance so the gauge is worthless without defiance. PLD, on the other hand, HAS sword oath, so they are missing a chromosome if they think they should have been in tank stance, but again, it literally doesn't matter. Hell, you don't even need a tank in those dungeons. For DRK, they can do both because they have Price and Weapon.

I suggest, for a Warrior Guide, GO. TO. THE. BALANCE. DISCORD! Read the Warrior guide to learn it, seems like you have the basics down. Graehl Gaming does excellent crash course tanking guides.

WAR checklist: Storm's eye always up, refresh if under 7 seconds with eye combo. Use path otherwise to generate more gauge. Use infuriate on cooldown, if lower than 7 seconds, fell cleave or inner beast once you have the trait for infuriate. Never overcap gauge, build it to 90, then cleave or beast. Enter inner release with at least 17 seconds left on eye buff, 19 if you need to cleave beforehand to dump gauge.

That's pretty much it. Also, keep Upheaval on Cooldown.