Auburn was advised to do the same thing with Cam. They went all in, and the NCAA blinked and folded. I'm hoping the embarrassment of that situation will weigh on the NCAA's minds this time around, but I'm not holding my breath. I figure they'll finish the investigation right after Manziel declares for the draft.
I'm still trying to figure out the motivation of the autograph dealer: they showed the video to ESPN, but didn't sell it to them, won't show the NCAA, and kept their identity a secret. Other than harming Manziel, a guy who did what you paid him to, what's the desired outcome?