He's gonna eat Zeke.. It's the only possibility. There are only two descendants of King Fritz Left. Dina was killed thanks to Eren, and Historia's family is gone thanks to Dr. Yeager and Historia (This family is fucked up wtf, they've literally all been killed by someone related to them in some way). This leaves only Zeke and Historia. No way he's gonna eat her, so that leaves his bastard of a half brother. Ratted out his parents, killed Erwin and the new recruits, and turned Connie's family into titans. Wow literally everyone except Jean and Sasha have a really good reason to destroy him.