I don't think anyone has proven the entire string of events, soup to nuts, no.
I think we have seen verified that this guy from Michigan bought a ticket to the Tennessee-Kentucky game, just as he did to one of Clemson's games and a host of B10 matches throughout that season. I think it has been verified that he gave some of those tickets to friends and associates, who attended those games; others, he attended in person. I think it has been all but confirmed that he was on the sideline--not just in the stands, but on the sidelines with the team--at the Michigan State - CMU game at the start of that season (he was on the CMU side, one would assume with their express consent, as he spied out Mich St's signals).
So it stands to reason that the Michigan cheater had Tennessee's (and Clemson's, and Michigan State's, and several other B10 teams') signals scouted out. But what did he do with them? How did he use them to benefit Michigan? This is where it gets more circumstantial. But some parts are very suspicious.
Such as Michigan standing to benefit from knowing the Vols' signals. Either directly, as a potential playoff opponent, or indirectly, if Michigan could find a way to spoil the Vols' standing and make more room for Michigan in the top 4. Recall how things stood back then, with the Vols #3 after beating Bama, and then #1 just before facing Georgia (the Kentucky game was in between those two):
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Such as the cheater, I think his name is Conner Stalions, being an old, longtime associate and friend of a few of the USCe staff, including I think head coach Shane Beamer.
Such as South Carolina's players wearing wrist bands for only two games that year: Tennessee and Clemson. Recall, those are the same two non-B10 teams that the Michigan cheater bought tickets to.
But those are just bread crumbs, not a solid trail.
All of this, the NCAA investigation continues to ferret out. Eventually, we'll know a lot more. For now, we can only suppose based on the parts we do know.
I think SJT approaches all this most responsibly. He doesn't jump up and down saying he KNOWS the gamecocks cheated against us. He says only that the evidence seems to lead that way and so he believes it is true, while waiting the NCAA results.
I'm pretty much at that same place. I believe it's true. But that's just me.
Go Vols!