The mighty Ed Whelan has noticed it too.

He also takes on the question: who in fact wrote the "joint dissent"?  Ed first floats the view that the joint dissent was drafted as the Opinion of the Court, but then Roberts failed to find it persuasive, thus yanking its fifth vote. But OTOH, says Ed, why would the Chief not have assigned the Opinion of the Court to himself in the first place?

Well, I