So apparently Erin, like the Ape Titan (and maybe Annie to a much lesser extent), has the power to mentally dominate and command other titans. This is an interesting development.
So it raises a few questions:
Can Erin command a shifter? It was clear that his use of this power visibly and significantly affected Reiner, Burtholdt, and Yimir. If he put his mind to it, could he mentally dominate them?
I think it has something to do with the Ape titan's ability to not only command, but the scramble. People say RB were just being obstinant to Ymir when she questioned them about the Ape, but they looked utterly dumbfounded, like they couldn't remember what was just right in front of their face. Kinda like a perception filter / the Silence from Doctor Who.
Was the fear of falling prey to such an ability part of the reason Yimir decided to stick with R&B, even if it meant being separated from Krista?
Might be part of it, but it looks like Ymir is still running the long gambit. "With a power like that, life in the walls might be possible" doesn't really sound like she's afraid of anything, just weighing out what is the best option. If I were to guess, it's that she's going with RB to distract their faction from attacking the Walls that Christa lives at. I'm 99% positive there are numerous 'Wall cities' dotted around the world that don't know about each other. I wouldn't doubt it if we saw her with RB attacking an unrelated Wall city with a totally different population of people. Maybe the mystical orient? Would be cool if that Asian titan wasn't just a cameo but real foreshadowing.
What will Irvine, being the genius that he is, do with this new power at his disposal? This could really give the Scouting Legion a major advantage when outside the wall if Erin learns to control this power.
Well we know that Irvine said he 'has a replacement', so there's a chance he might be killed unexpectedly or taken out of the political equation due to higher ups not wanting the Scouting Legion to succeed in finding shit out. As for what the government/police will do with/to Eren, who knows. I doubt the legion will be able to keep this information under wraps.
My bet? There will be a military coup to overthrow the corrupt government/police and force the Wall cult to spill the beans. Irvin will lead from the shadows and Levi will be his 'replacement' he mentioned earlier, to deal with everything on the front lines.
Can Erin use this power to force Annie to come out of the crystal and disclose information?
I hope he can somehow at least mentally force her to undo the calcification or something.
---------- Post added at 01:32 PM ---------- Previous post was at 01:19 PM ----------
I like the 'ape made them do it' theory! It does sort of absolve them to a bit too much of a degree however? Something about BAR's story seems to suggest they did what they did believing it was unpleasant but absolutely necessary. The way they talk about destroying mankind doesn't sound like they totally did it against their own free will. There are a few instances that give me that impression, like Bertholdt's reaction when Eren asks him what he was feeling when Eren told the story of his mother being killed. 'At the time, I felt sorry for you'. Just doesn't sound like the words of a guy who was forced to murder thousands of innocent people.
Or more like killing the wall civilization is the greater good for humanity outside of the walls. They walls were almost certainly erected by titans commanded perfectly to stand in concentric circles for miles before calcifying into each other by some other entity, most likely the Ape titan. RBA were probably sent by the rebellious 'Warrior' faction because of their exotic abilities and the absolute necessity of killing the Wall people... it certainly isn't because of their mental fortitude lol. Annie's got daddy problems, Reiner was so not-ruthless his brain resorted to dissociating his identity, and Bert acts pretty cowardly for a guy assigned to do the things he's doing.
It would take too much away from the story if everything was just 'and the Ape made them do it because mind control'. The 'command' ability seems more like a perception altering ability than anything. The titans suddenly responded as if Smiley was a great, big, delicious human.