This is DEVASTATING. This is exactly the equivalent of CBS's fraudulent documents. The content of the documents or the debate become 100% invalid if the mechanism for them is found to be forged or cheated.
This is utterly crushing stuff if the hi res proves out. This is the equivalent of evidence being obtained without a warrant being inadmissible and if fraudulent evidence is knowingly offered the court the lawyer doing it is disbarred.
I don't disagree with your characterization, which has quite a lot of zazz and passion in it.
But overall it's this: It takes JK's "gains" and "momentum" off the table at once, and even reverses his previous standings in polls and perceptions. He will have to defend it. If he cheated, it's over. If he cheated, and people believe it, Bush by 8 pts or more.