Mr. Bernoulli.....
To clarify, the flying of BA owned 757s should only be by BA pilots represented by BALPA( I'm certain you could have figured this all by yourself without going all lawyer about it) .
If BA wants to use a marketing ruse for public consumption that is up to Little Willie. Call it,the airline, whatever you want. I'm sure BA pilots would like these assignments, if done properly. Otherwise it's just more 3 card Monty trying to ratchet down your T's and C's. Capiche ??