I don't understand...

[Foo01]

So that's 8 dungeons minimum where they couldn't do their job?.... That also means they subjected 24 other people to thier play. People who I'm sure must have said something at points. Meaning this tank has likely ignored any advice to this point anyway.

You don't have to do all that much for stuff before brayflox. Losing aggro all the time in dungeons before brayflox hardly ever led to a wipe. And even if other players complained, the tank could just muddle thru. Brayflox is the first real test. I know because I had to figure this out:
http://forum.square-enix.com/ffxiv/t...r-geared-tanks

And even then it was more about surviving than aggro managment. As a GLA/PLD it is very hard to tell if you are handling aggro right or not, because it always seemed like you would lose aggro to level synced DPS before you get shield oath at level 40. See:
http://forum.square-enix.com/ffxiv/t...arning-to-Tank

And even now with iLevel81 PLD, I still have aggro problems with bard and blms with top level gear. They will still peel stuff off at times:
http://forum.square-enix.com/ffxiv/t...rol-your-aggro

I had to learn to deal with all of this stuff, and I sought out advice. But you can't expect everyone to do that.