I agree...sorta. I think part of it is Oliver is still a softy when it comes to family. He had the same problem with his other sister, so this isn't at all surprising. He's still trying to win her over.
After the last episode, sure seems like Emiko is the leader, but only up to the point that Dante allows it. Essentially, Dante is still in control and Emiko is more of a figurehead. Will be curious to see if Oliver can actually turn her.