Problems with Plantinga's A/C Model

For my master's thesis, "Nonevidentialism, Pluralism, and Warrant: Plantinga, Hick, and the Epistemological Problem of Religious Diversity" (excerpts of which can be read here), I offered a sympathetic critique of Plantinga's A/C model, which he develops in his magnum opus, Warranted Christian Belief. At the time (nearly two and a half years ago), I sent him my final chapter, which he responded to favorably though briefly. It seems that now, in the clearer light of his retirement, Plantinga has come to terms with some of the problems of his A/C model, though they might not be quite what you would have thought: