NO it hasn't ... here is why. If it was true, the defense would not need to contest or argue the science. After all, they aren't arguing the fact Caylee died and that her body was in Casey's possession at the time and for some time after, all the while, decomposing. If it were true that it was an accidental death they should say ... "you know what .... Dr. Vass is a scientific genius, the dogs and their handlers .... brilliant!! ... cause they got it right!!" The fact, that they are choosing to fight the scientific evidence and bringing up Roy Kronk's motives at all, says that they have no way to prove any of their theory. Mark my words ... WE WILL SEE NO PROOF, TESTIMONY OR EVIDENCE to back up the defense theory of how Caylee died and none to back up Casey's claims of abuse, finally nothing to implicate George in a cover-up or worse. Investigator's gave KC this out early on. YM begging, "please tell us if there was an accident" (paraphrasing). I believe that it is what the investigators wanted to hear at that particular time and if she had come up with that story then, she wouldn't be where she is now ... and the good people of Florida wouldn't be getting a bill for near $1 million of their hard-taxed dollars! You have to keep asking why and eventually you will see that ultimately it is because it made a better tale ... a better book ... a better movie.