Re: Jim Leisenring's "disciples"
Probably the most well-known of them was Vernon (Pete) Hiddy. He developed many of his "Flymph" patterns based on what Leisenring had written in his first book. Pete's contributions were added to a later printing of that book.
Can't help you with the others..........................
I used to fish the same stretch of Broadhead Creek in Canadensis, PA that Jim and his disciples spent a lot of their time fishing; great stretch of water.