If you're being rebooked, I find it difficult to believe that you just happen to end up with an aisle and a window seat in a row slotted around an already allocated middle seat.

Rebooked into 2 completely different rows I can believe. Rebooked into 2 adjacent seats I can believe. Rebooked in such a way that you have window and aisle in the row, sorry, I think you're making that up to avoid admitting that you play games with the seats you choose and then drag the middle seat occupant into your games when you don't end up with a row to yourselves.