If he's one of the witnesses, and I'm guessing he is one, then Trey has something that we've been prevented from learning and if, and it's a BIG if, he might have been in the same room as others, such as the gal from State, that mentioned "watching for six hours....." he can name other names.
Who knows, we do know that there are many witnesses that have been prevented from giving any testimony to Congress and the public.
The way that Fox and some in Congress have been holding on to Benghazi tells me that they know far more than they have been saying. The whistleblowers have been talking to them off the record.