[MANGA SPOILERS] 103 and the thing that no one is talking about.

Right after the Attack Titan loses it's face to Warhammer~chan's crystal Eren says he has one last trump card left, or in the official translation, that he's not done yet. What does Eren have that is so powerful?

Armin? Annie? Zeke? Does he expect Reiner to aid him? What is Eren planning? I've got a few ideas.

• Eren is buying time for Zeke to come to his aid. Whatever way you choose to look at it, it's clear Zeke is planning something alongside the Survey Corps. He's stated twice now, although in very different ways, he has no interest in hurting his brother Eren. Will he fall in from a plane? Will Eren consume him gaining access to the coordinate?
• Eren is buying time for Annie. Annie has been out of action for so long now, yet she continues to be the topic of many discussions throughout the sub. We haven't seen her father since him and Karina presumably escaped in Chapter 101. There is a lot of evidence to support Annie coming back, but not enough to say she'll be on the side of the Survey Corps. Besides, a wise Eren wouldn't hesitate getting someone to consume her, would he?
• Eren is buying time for Armin. Yes, we've seen him explode as of Chapter 103, but something tells me his next show isn't far away. We'll be seeing the Colossus Titan soon, but what role does it play now? In Season 2's opening, we see the Colossus Titan standing in a field attacking the Survey Corps, but for some reason that doesn't seem very practical to me. Whatever Armin does will be big, ahah.

Welp, those are my 3 ideas as to what Eren has in store for the rest of Marley, but something tells me I'm completely wrong and Isayama will continue to surprise us. Let me know what you think below.