Never assume, they switch flight crews all the time. If one crews has been practicing for a mission what good would they be over here!! If you assume You will make an “Ass” of “U” and “Me”.
I doubt they switch crews “all the time”. Carrier crews, including pilots, are out for months at a time. If The Disaster is seeking to Wag the Dog he isn’t flying in new crews. The bombing runs you heard almost certainly have nothing to do with what may be happening.