Yes, Julian had orchestrated the entire plan himself. He had someone play Delier under the lights, counting money, knowing Corder would "just happen" to come across it and rob him. There had been at least five witnesses to the whole event. Julian had also arranged for Corder and the other two to be kidnapped in an unlit part of the street—where he had someone break the streetlights at dusk—and brought to the warehouse.
He had come today to deal with the three of them and bury them on the farm. Once Gador couldn't find them, Pronto would have no excuse to protect him. When faced with someone of Lady Vivian's stature, just saving himself would take all Pronto's effort. Why would he risk helping Gador? Gador wasn't his son, nor had he given Pronto any significant benefits.