As I said, all the good stuff that is in the Protestant groups come from The Church. There’s a lot more of the good stuff that, thanks to God’s grace, resides IN The Church. And, there’s a lot of bad stuff in the Protestant (big umbrella term incl BAptists, Pentecostals, 7th day adventists etc) that is from non-Church sources.
When you say, "There's a lot more (emphasis mine) of the good stuff that, thanks to God's grace, resides IN The Church, it implies that there may be some bad stuff in "The Church" or that "The Church" has relatively more good stuff than Protestant groupings. For what reason would God grace the ambiguous "The Church" more than he would grace Protestant groupings?
When you say Protestant groupings get their bad stuff from non-Church sources, and by implication "The Church" gets it good stuff from "The Church", it renders your theory tautologous.