”he recommended that I do bench as follows: 10, 8, 6, 4, and 2"
might be a good way to get more volume in, but I would ask him a) why not separate out the high volume / moderate intensity 8-10 rep work on a separate day from the high intensity doubles? and b) why not warm up to a heavy double first, then get the high rep volume in descending sets? I'm always keen to do heavy sets without fatigue, my instinct is it's better for training (apart from anything else, I can lift heavier that way) and less prone to injury.