While he needs to be aware of this, and I'm sure he is, the fact remains that death is knocking on his door, so that sort of make all these studies irrelevent in his case. Granted, he's going to have a hard time during recovery, but it's better then death.
Please understand, I'm not knocking your post or the stats, though I don't believe in them at all. I'm just trying to bring a true life prospective to the issues at hand. He hasn't got time to lose the required amount of weight without posing a significant loss of life danger.
My post was just to show some key words used in a quick search that yielded something on the general topic. It would be up to John to evaluate the research he finds to see whether it supports him. He seems to be in the unenviable position of needing to do medical literature research for his PCP to present a case to the insurance company. My understanding is that he needs to bring his thoracic surgeon, weight loss surgeon, and insurance company around to your point of view.
John--I wish you well in your quest, and hope you get the help you need.