I have heard this over and over again and it makes perfect sense since few live long lives on dialysis. Especially when you are on the road and in hiding as OBl was. It's just common sense.
On the other hand I would be hard pressed to document any of this. can you help me with any links or other documentation?
Actually, I have been digging around a little and the link above is pretty darn good evidence that the likelihood of OBL living much past 2002 is really low. People on kidney dialysis as long as he was just don't make it. One comment by Sanjay Gupta that OBL appeared to be in the final stages of kidney failure really drives up the speculation.
I think its a lot more than speculation.I think he died in Dec. of 2001. Zero was desperate to have something to run on and how many times have we heard about how he killed OBL.