Something occurred to me. The updates Yoshi-P has been pushing out have been somewhat disappointing thus far, and that led me to wonder this very question; Is Yoshi-P just working on the core aspect of the game, while Tanaka works on developing more content for the game?

Here's how it pans out: Yoshi-P's team works on fixing the game and the core battle system. Tanaka's team focuses on developing usable content and assets for Yoshi-P's team (ie. Ishgard, new zones/regions, classes/jobs, etc) and passes them off to Yoshi-P for finalization and implementation.

Now this doesn't mean Tanaka has a final say in the overall vision of the game, but rather produces the actual resources for Yoshi-P's team to utilize in developing the game. Let's say they want to make Ishgard available by the PS3 release - they haven't said anything about that yet. Maybe this is because it was content already planned by Tanaka prior to the team changeover. They're still working on producing the actual game resources (environment models, sound, ambient music, etc), but Yoshi-P isn't ready to announce this content until he figures out how to fit it into his vision of a resurrected Final Fantasy 14.

That's what I think is, or ought to be, going on. At least in this way, Tanaka has an opportunity to redeem himself for his mistakes.