I don't think he's a serious target as far as prosecution but his testimony is likely to be truthful because he's so timid. I can't imagine that guy in prison, he wouldn't last a week.let's not go presuming guilt just because he's threatening to take the 5th. It's a useful tool when dealing with potential criminal liability. Especially, in a setting that he knows that , even if innocent, he might trigger a perjury charge. And no doubt something he was advised to do by his lawyers.