Looks like we are in for either another DBZ or a power-level scale that makes no sense. I hope they take care of this problem by capitalizing on the fact that Rukia was much weaker than that first thing that escaped from hell, and thus she and Renji will be finally silenced upon entering hell. It seems the captain-commander was fed up with how annoying they were as well and decided to send them in alone and told them under no circumstances may they receive assistance.