I've noticed that along the Serco route, the transport usually jumps between 4000-6000m away from the wormhole, whereas the Itani transport usually ends up between 1000-3000m away. This means that on the whole, the Itani have far more time to catch up with and attack the Serco convoy than the other way around. It's only that the Serco are so good at what we do with the equipment we're restricted to that we do as well as we do.