There were no flight crew changes/issues when these flights were moved from BA mainline for the subsidiary so I would not expect any changes if the flights move back (I can see that the "operated by" details on my 2015 BA1 flights have changed). I do wonder if they have got FAA approval for the change under the AA codeshare numbers (as this is a change to the codeshare arrangements) - I recall there was a delay when the flights were moved last time which meant the flights could not be booked using the AA numbers for a while.