Hold on, you said you daresay that he spoke to Voronon, which was your justification for how'd he know about his weight and health, etc.
Did Vassili's grandfather describe Voronin as "grossly overweight" "suffering from an excruciating back injury"?
What exactly Vixen, is the evidence that Voronin was a grossly overweight man with chronic health problems and an excruciating back injury? So far all we've got is, at best, a 34 year old broad shouldered bear of a man being able to survive the Estonia... which seems to be pretty much the opposite of the fantastical narrative Vixen has invented.