Unless Fennec is working for Omega. She could be going by a different name, maybe Omega is in charge of this new syndicate. The only person who Boba Fett couldn’t kill would be his own sister. If he found out he had a sister, it would be heart wrenching for him.

His father was killed in front of him, he’s all alone in the universe. Maybe that’s why they keep showing his dad fly off Kamino in his Bacta tank dreams, all his family is dead, or presumed dead.

Maybe Omega reveals the truth to him, as well as some surprises he’s not expecting.

It could be a family reunion of sorts