But it's not significant in the domain this thread is focused on. In order to lose signal to an rival in this scenario, the delay between your Order A hitting E

But it's not significant in the domain this thread is focused on. In order to lose signal to an rival in this scenario, the delay between your Order A hitting Exchange A and your Order B hitting Exchange B would need to be sufficient to give the rival time to learn the signal, and then to act on it. At a minimum, that is half the cost of the round-trip time between the Exchange A colo and the Exchange B colo. So long as you're not introducing such substantial delays in your order dispatch, you're fine.