Perhaps rather than disabling the orb buff, make people go to the middle of the map, where orb is active and either get it right away, or activate it after 1s with “F” action key. You’d have to do it after each death.
Logging on to the map and having a stat bonus without any effort is a bit OP.
It would also fix the GvG issue where a stat bonus on one side would throw off the balance.