I would say zero. There is something off about Roberts and his rulings that defy pure legal logic. Would Lin, as an attorney specializing in defamation law risk saying things that Roberts could take him to court with and win? I don't think so.
People who have things about themselves they want to hide, don't dare risk suing or counter suing for fear that it would all come out in court.
It's possible Lin Wood's strategy in accusing Roberts is for that reason (Roberts wouldn't be that stupid to take the bait) or maybe he's just trying to get Roberts to recuse himself.
Trump's good at baiting people or backing them into corner so they have no choice but to admit things they would otherwise not have divulged.
true.
Would Lin, as an attorney specializing in defamation law risk saying things that Roberts could take him to court with and win?
Where is an example over the past several decades of a high public official suing a citizen for slandre/defamation?