As I said, I would hesitate to simply dismiss someone that we all know to be a serious scholar, a man learned in Scripture, and a devout Christian, just because his personal interpretation disagrees with yours. Is everything he brings to the table worth nothing?
Did I say that? I believe I said I had learned much from Lewis over the years. What I am dismissing is not Lewis but his belief in purgatory based on the scriptures I cited. He apparently believed in it because it seemed reasonable and to support that belief, he references a poem. That may be the perfect scholarly thing to do, but it's not theologically sound. Because of that unsoundness, I'm not going to give him a pass just because he's very scholarly and very devout.
As far as J.H. Newman is concerned, I haven't heard much of him. An Anglican minister with a Calvinist persuasion sounds like rather an odd duck. His Calvinism is perhaps more of a 'lean' than a 'persuasion' otherwise, he wouldn't have slidden off into catholicism.