Personally I still cannot figure out the dynamics, how is that possible, that the kayak was found on the 15th by the fishermen, and not him (more or less) right away too, being it in still water? How can he have drifted away? Did he fall due to health issue, and try to swim to the shore and drowned? He had a lot of experience with water so this I cannot believe. If he had for instance a heart failure on the kayak or a vascular accident, he would not have been far from the kayak, there is no real current apparently on the reservoir.
I suppose the autopsy will see if he had water in the lungs and how much of it.
I don t know ehat you think but I find all this bizarre and extremely unlucky for a man with such experience