I got no hard evidence, largely cause they edit the shit out of the videos and arent dumb enough to say it in public, but there have been off hand comments referencing gavins awfulness behind scenes and shit and there was one video where they were doing a LOT of editing around what cavin was saying (I think it was an AWHU from a very long time ago, like pre-ryan long ago), that I would 100% put money on the fact that.. like I said, he not only says the hard R, he says it with laughter and glee.

and hes probably not the only one, I just think hes the most likely.

but to be clear, supposition and such.