I don't think Ana is a bad trainer by any means, I agree with you Tomato that it is a different ballgame. It seems that damage can be reversed quicker if you are younger. Not to say that the blue team can't start really dropping the lbs, I think they will, but probably three or four weeks in, which will be the reverse for the red team.
I agree that a four pound drop is awesome to have in a week. I think Bob might have got the same results as Ana. I think another issue the blue team has is that the larger contestants are on the other teams, and it always seems that those with more to lose drop off the pounds quick in the beginning.