You really don’t get it.
If a team dedicates a strike team to “help a priest” being dragged to hell (some remote corner of the map), then they will lose battleground objects.
This is why we only have MW/Dragon on your teams atm, because the risk of being queue sniped by a blood dk swap is still too high. The only way we have a priest is if
One: No other formidable teams are on.
Two: Priest is invited at the very last moment to avoid queue spies.