Four arms would create symmetry. But add some mods for stronger body as well - great candidates for olympics.
Three arms work for Moties. Why not him?
In addition, the justices may have some decisions pending for which Scalia may not yet have given opinions.
It is not clear that a 'vote from the grave' will be permitted by, among others, Chief Justice Roberts, as vote can and do change between the initial vote and the actual rendering of the decision. That might deadlock the court 4-4, leaving the appellate decision in place. That will favor conservatives in Texas and favor liberals most everywhere else. I'm pretty sure everyone (other than Cruz and some of the other TP types) will rally around a moderate, and that is just what Obama will nominate. Frankly, for conservatives, better him than Bernie.
Personally I think the quality of public discussion of and reporting about science has dropped greatly in the last few decades..
I expect that is what you are actually experiencing.
Always try to do things in chronological order; it's less confusing that way.