Perhaps your right with regards to that. My FC leader is a Tank who is dps mad, so I am well acquainted with that concept, but the instance which sparked this whole thought off for me was today when I was doing a DR high run of Snowcloak. The tank was a fully Law geared including weapon, Warrior. He didn't use defiance which mean that myself (Summoner) and the Ninja were constantly ripping aggro from him within the first few seconds of a pull. He ignored all the mechanics of the dungeon and didn't respond to anything any of the party said. It got a bit annoying when I was having to run over to him every minute to get him to grab bosses off of me -_-