All speculation, but I'll make some guesses. I haven't read the manga, so people who have will know more than me.
1. Infiltrate and investigate, destroy from the inside. No idea why his village was important, just seemed like the people in the village had turned into titans some how.
2. It was Erins dad. I don't think he was controlling him, working with him.
3. Exactly. He can control mindless titans, apparently a very powerful ability.
4. No idea. Possible though
This post was edited by jadeoshbogosh on Jul 8 2017 05:54pm