The Newman Club at all major universities uses his understanding of history, and doctrine to confirm Catholic theology in every dot and iota. If you hadnt read his book The Catholic Church, I strongly suggest you do.
Of course it's going to jive with RCC theology....the key phrase though is "his understanding of history"....which is not necessarily the correct one.
But none of this addresses the point I noted in the link you kindly provided about other writings and the credibility given to them by Rome. That is a very disturbing admission by Rome.
No,its not.
It is “his” understanding of history that subsequent converts Episcopalian and Lutheran have since embraced. Cardinal Newman does give the appropriate theological responses into the kinds of queries you raise.
http://www.culturewars.com/CultureWars/Archives/cw_feb98/Newman.html