It's a workable plan, Doenitz. In my case the other idiot did himself in by being a jerk, and that bought me advertising space, if you know what I mean.
While you're at it, look for the underlying factors in what she says if she mentions anything about the other guy. That often reveals the things that she holds of high importance.
At the end of the day, if you can work your way into the role of confidant, you're in a very strong position. Just a word of warning, though - if she says she feels safe with you after the relationship's started, it's fine, but if she says she feels safe with you
before the start of the relationship, make sure you don't end up in the "big brother" role. Not everybody's inclined towards incest.