Sorry, did not want to give the impression that I am uncertain about what they'll say. I'm confident they'll both say positive things about me.
actually its pretty common (at least post-submission - thats what the "waive rights" checkbox is for, if you wish to see what they said about you) but i'm not concerned with what they say after my app is submitted. I've put together my rec package for them that has "prepped" them, so to speak, on what bschool recs are about. This is more about my own concerns that if both recommenders write about the same story, then the adcom's will see me as having few things to talk about.
What I do want to do though, is to get some diversity in the examples used in my rec's since both writers have worked closely with me on the same project over the last 12 months. Granted, they held different positions and have different perspectives about it, but it would be nice if the rec's cover a broader variety of examples rather than both saying "hey this one time in March" and they both refer to that example. ...and THEN, in my essays I also write about "that time in March" and now it looks like I've only got one thing to speak about. Does that make sense? Am I over-worrying and this is just the risk you take?