Today the Supreme Court decided Gonzalez v. Trevino. The case was argued in March. One would expect that the Court would issue a regular signed opinion that notes the authorship of the majority opinion. But the Court did something different. It issued a five page per curiam opinion, reversing the Fifth Circuit. The upshot of a PC opinion is that we do not know for sure who joined it. Justice Alito wrote a sixteen-page concurrence, Justice Kavanaugh wrote a two-page concurrence, and Justice Jackson wrote a two-page concurrence joined by Justice Sotomayor. For sure, Alito, Kavanaugh, Jackson, and Sotomayor joined the majority. But who was the fifth vote? It was not Justice Thomas, since he dissented.
We do not know how Chief Justice Roberts and Justices Kagan, Gorsuch, and Barrett voted.
Why is this a per curiam opinion? It is possible that Justice Alito was assigned the majority opinion, but lost it, and the Chief came in to salvage the majority with a narrow per curiam. At present, Alito does not have any assignments from the March sitting.