Scott, I'm glad you've done this research. As a young Pentecostal convert, I was blessed to know several members of the Yadon family and I was very fond of Ellis Scism. It is interesting to learn about Harry Morse who was a major influence to these men who I knew in their latter years.
I have come to understand from several sources, including my friend Tom Fudge's books that some of them did not believe the message of the New Birth the way I was taught it. I haven't moved on the
Acts 2:38 message, but I will let God be their judge and will continue to the fondly remember the blessings imparted to me by them when I was young.