Eren's supporters are radical and act like assholes, but Eren's overall direction is not wrong. He's just chosen a side to save and has the balls/insight to know that this would be the only way forward. I guess he also hates being oppressed so it's easy for him to stomp on everyone else if that's what he sees as just. Everyone else who thought Eren was "going too far" or was "making too much collateral damage" has nothing to say when they're reminded that the world were going to wipe them out.

Everyone else is hesitant, but ultimately aren't willing to sacrifice themselves for the sake of the world.

Gabi's interesting but she's also an "Eren". Difference is that she's currently powerless. She no longer wants to flatten Paradise Island, but given Eren's ultimatum now, it'll be interesting to see how far she'll go to stop him.

Armin thinking about leveraging Gabi was something I hadn't considered. He's more level headed than we think even if he lashed out.
It wasn't a bad move though. Mikasa will have to think for herself this time.

I don't get why Annie's dad decided to get himself killed. His flashback of wanting to see his daughter come back alive does not explain it at all. He knows that an Eldian acting out of line doesn't make a Marley listen.