He should stay in Birmingham until the Southern League All Star Game is over on June 19---then be sent to Charlotte for the rest of the season. Play about 125 games for the season, tell him "nice job", and see ya at Soxfest. Then next March, send him down at the end of spring training, and bring him up after the 7>6 date.
Of course by the time the next CBA gets ratified, it may be a 6>5 date.