I spoke with Larry, the host of Muscle Radio, a little more on some of these issues and based on our conversation, let me elborate on a few things..
Ronbo you're a little off base my friend. Everything you are saying is related to conventional dialysis as Don admitted on the show. Apparently you didn't listen to the broadcast yet.

He (Don) would have to have a full medical exam within 24 hours, so high blood pressure is not an issue...he'd be pulled from the show.
As for whether the doc would would have to travel with him, I don't think that would be required. He could go to a local clinic in NJ when he arrives, do a dialysis session and have his vitals and blood work done.
As for the doc signing off on it, two points. One, keep in mind that Don is potentially a HUGE (no pun intended) success story for a new treatment (nocturnal dialysis) that could help God knows how many people with kidney failure. So, if his doc is really confident in his health at this point, he might just sign off on it because of the potential positive impact on the patient community at large. Second, if the doc won't sign off on it, why would the IFBB, a non-medical federation?
And, yes, Tre you are right. If he is healthy enough to do it and shows up at the show, the potential for positive exposure for the sport could be a great thing. In Don's words, bodybuilding saved his life and his condition was clearly genetic and is reflected as such in his medical reports after scans of his kidneys were done.
Look at the photo of Don on
MuscleRadio.com, same one posted here in the 12 weeks out thread and see if that looks like a guy who is so sick and lethargic and ready to drop. If he was in that bad of condition because of his dialysis, could he train hard enough to carry 260 and look like that? As Don's sister said on the show, no one who meets him has any idea that he has any health issue at all.
Pep has received a number of emails related to this show already and he thanks everyone for their support. Don also thanks everyone for listening and hearing his full story.