This is what I understood, for those who are lost:
-Yelena talked with Eren. After that Eren did his trip to Marley, exchanged letters with Zeke, and started the war.
-Yelena confesses she talked with Eren (Floch helped them meet up), but says she didnt ask Eren to do that, he took action by himself.
-The military starts believing Zeke is controlling Eren -¿probably with his own Titan-controlling powers?-
-They decide to have someone titanize and eat Eren to have another founding titan shifter who is easier to control and not in Zeke´s hands. Thus Zackley tells Mikasa and Armin that they cant meet Eren in prison.
-The Eren Fanclub led by Floch says "fuck you" to that plan and breaks out of jail. They want to meet Zeke (Zeke and Eren want to try if by joining hands they can activate the Rumbling, which is necessary to safeguard Paradis since the other nations will soon attack them).
NOW
Is Eren being controlled by Zeke? Probably not.
What does Eren want? To free Eldia, no doubt, and it seems he is accepting Zeke´s plan so far. The plan apparently involves to have every other nation as an enemy, and to be able to activate the rumbling. (Maybe they just want to kill everyone).
What does Zeke want? To free Eldia, supposedly. But god knows.
Who is best girl? Hitch is the right answer here.