I think only the Chief Justice has a roll. Of course he may just surrender any power he has to the Senate Parliamentarian like the last one did.
In fact, that is what I'm saying. The Constitution makes it pretty clear that the Supreme Court has practically nothing to do with impeachment. Yes, the Chief Justice presides. That's it. The other justices have no role at all. And as for the Chief Justice, no one really knows what "presides" really means. The Court's place in all of this is practically "nothing".
And to go from "practically nothing" to a suggestion that the court should jump into the fray and block the whole thing is just very ill-advised.