According to Salon, Roberts wrote both the majority opinion and the dissent. To summarize, Roberts initially joined the conservative justices and assigned himself the writing of the majority opinion. Much later, says Salon, Roberts changed his vote and then assigned himself that opinion as well- leaving the dissenters scrambling to write their dissent....

Quote Originally Posted by Salon
This source insists that the claim that the joint dissent was drafted from scratch in June is flatly untrue. Furthermore, the source characterizes claims by Crawford’s sources that “the fact that the joint dissent doesn’t mention [sic] Roberts’ majority … was a signal the conservatives no longer wished to engage in debate with him” as “pure propagandistic spin,” meant to explain away the awkward fact that while the first 46 pages of the joint dissent never even mention Roberts’ opinion for the court (this is surely the first time in the court’s history that a dissent has gone on for 13,000 words before getting around to mentioning that it is, in fact, dissenting), the last 19 pages do so repeatedly.
If this is true... wow....