I feel like defense should utilize the high ground on A but then probably just play the point on B. Pushing up a bit further on defense can be catastrophic if the other team has at least one flanker to get on the point, because the map seems HUGE and it takes awhile to run back if someone sneaks in. Unless someone on D stays behind and just guards the point (risky), the enemy's sombra or tracer could get a tick before anyone even deals with it.