Leaving 3-5 is enough to stop the stealth, our main force that heads to SHGY intentionally clashes with the alliance main force heading to IBGY.
We call out left or right to intentionally clash 20ish horde Into that alliance group and maybe 10-15 don’t do the clash and don’t defend but instead go for SHGY.
You haven’t been in AV for months though, so you don’t know how it works now.