That is not at all what he posted. The decisive factor wasn’t any response from his alliance teammates, it was the response from his horde opponents. If alliance soft capped IBGY, horde either mass recalls to take them out OR the horde continue on offense, in which case it becomes a race that alliance can win (according to his estimation) about 30% of the time.
What happens when it turns into a turtle?
The decisive factor over his wins and losses has not been decisions made by his team, but decisions made by the other team.