davydenko' story does seem plausable, that there could be a leak about his sore foot. he did have a stress fracture from the doctor...but he could easily paid the doctor off. and he did really well in the US Open.
he is more german than russian. but those three russian accounts were opened with false name...highly suspecious.
there is no doubt the match is fixed, but it'll be impossible to prove. as time drags on, it'll be harder for ATP to find more supporting evidence.
my theory is that someone has leaked the information that he might not complete the match. he has a lot to lose for match fixing...i don't think he is dumb enough to do that.