Having position: could it be mutually beneficial to swap places?

[RoundTower]

I've never seen this discussed before, but a situation arose a few nights ago where I started thinking about it.

I am a loose player, seeing maybe 50% of flops often for a raise, especially in position. The player on my right is a rock who plays maybe 10% of hands outside the blinds. For the sake of argument lets suppose we have the same expected winrate.

Now if the seat to my left becomes open, it seems like it should be to the rock's benefit to take it and have position on the loose player (me). However I am happy to have him on my left, since I will rarely be in a pot with him. So it seems this change should increase both of our expectations in this game.

I think I'm correct so far. Now -- where does the gain in expectation come from? Is it really so bad for the other players in the game when the two of us swap places? Who, in particular, is likely to lose out here?

I have some ideas for answering these questions, but I'll wait and see what anyone else thinks.