Our own "invaluable" (according to Paul Krugman) Charles Gaba (Brainwrap) has the definitive word on the 6-3 Decision against the King v. Burwell challengers:
Since it takes at least 4 SCOTUS Justices to accept a case, I presume that the fourth one (in addition to Scalia, Alito and Thomas) was either Kennedy or Roberts, and that the only reason they agreed to take the case was mainly so that this could happen: