I use a weighted barbell for the deadlifts in phase 2 (while standing on a plate). I use the weighted barbell bc the olympic bar at the squat rack is always in demand and I'd feel bad hogging it for the whole time I need it.
Anyhow, since the rubber weighted, hexagonal ends of the barbell are smaller in diameter than plates, the bar already comes closer to the ground on the descent of the deadlift than an olympic bar with plates would.
If using a weighted barbell, is it still necessary to stand on a plate? I can see how this adds an extra inch if using an olympic bar but with the barbell I already get a good range of motion with the ends being smaller. I HAVE been doing the deadlifts on the plate but don't find that it adds anything.