No... I was first... and I had introduced my first bot that I built. .. but it didn't work properly so I went back and erased all trace of it and edited my first message... by that time Pandora had put in her response.
So the message moves to reflect the last edit... but keeps its original timestamp. If I now edited a message from the last 7 days you'd see it in today's replies.
Thanks for the detailed explanation. That is all good stuff to know.