User blog comment:NickFusi0n/A Theory on The Coordinate and The Wall Titans/@comment-24657600-20140528083449/@comment-24930713-20140529062838

I think in the case of RBA, if they want to destroy the walls and humanity. It would be easier to have the Coordinate. That way they could just order the titans out of the walls and let the other titans do as they please with humanity. Instead of spending countless days destroying everything. Plus if they don't get the Coordinate they would probably be susceptible to the person who does have it.(wouldn't it be possible to use the ability on them, at least while they're in titan form) Other than Eren not knowing he had it. And not understanding how to use it. What's stopping him from trying to use that ability on RBA or the beast titan. Although I think it would be dangerous for him to try it on the beast titan.(in the case that it doesn't work)

I think the Reiss family doesn't want to tear the walls down, but ensure that they stay up. But Hange seems, at least to me, to be right on the money as to why they won't allow Eren to keep that ability.