I agree about the rib cage. When I was in high school, one of my guy friends gave me a bear hug and cracked my rib!
I also agree that Jenna would be useless in a crisis but, as I mentioned in another thread, I still wish Madison had told her. That way we could have seen Jenna attempt (and most likely fail) to handle a true chief-stew issue.
The way it is now, whenever this whole thing comes up on the show itself, on talk shows, twitter, etc., Jenna will always be able to say, "Well, if Madison had told me, I would have handled it perfectly."
I don't like Jenna! I don't want her to have that ammo of "I wasn't told" to protect herself from critics!