What is the possibility that Justice Kennedy is the wrench in the works for this issue
Pretty good, actually. I'd also worry about Roberts. He and Kennedy might be on board for the shotgun under the bed, but not so comfortable with folks carrying pistols in public. That the Founders meant to protect individual ownership
of arms is easily proven. Their intentions on carry
are a bit trickier to discern.
Another possibility is that Scalia wants to pull back from the brink a bit, as he's mentioned a couple of times in the recent past. We can also expect serious resistance from Ginsburg, and Breyer (especially Breyer) on the issue. They've made statements indicating they refuse to accept the Heller decision and that the 2nd Amendment is a militia clause and nothing more.