Seems like Roberts should’ve recused, from the sham impeachment proceedings, since he’s tied into the FISA warrants (as the person who oversees said court).
No, because he is not a substantive decider in either venue. His role in the senate trial is perfunctory, and his role in FISC is no more than appointment of confirmed federal judges to part-time duty at FISC. I think the turnover rate is one per year, more or less, by statute.