The 6.4 provision is pretty standard, and often the reason for deal to fall through, in that enough of the requested information was not provided. You really don't know what was asked, what was ignored, and what garbage data was sent back. You think Twitter is all innocent? Pfffftt. Don't be evil, oops, i mean naive.
He doesn't have to prove fraud, or malice, or that it wasn't worth it....all he has to show is that requests were ignored, rebuffed even though they are reasonable, and responded to with bad data. That's not really a hard case to win.