User blog comment:IamJakuhoRaikoben/Chapter 369: The Place Prayers Reach, Review./@comment-5598380-20140201001146/@comment-7418318-20140201181259

True, but for the latter I have some theories up my sleves.

Tartarus wouldn't really have needed to know Crawfords location. If he was afraid that they might find him or if he was eager to join them for profit, he might have approached them on his own. Super Archive probably helped him to find their position, just like he found Jellal.

If Tartarus only told him that they are looking for the former council members in the beginning, without telling him the reason and him being to eager to please them to think about asking for it, it could explain how they got the positions of the former councilors without Crawford already pinpointing the sealers.

How Tartarus might have known about Face and in particular that it was sealed with organic link magic is a bit harder to explain. Maybe they were the ones to build it 400 years ago, but before they could use it their opponents sealed it. And while they were still trying to unseal and use it again, Zeref got his change of mind and thus the war ended. Or maybe the battle between Igneel and E.N.D. has something to do with why Face wasn't activated.