Previously the best summary I've seen about Hume and Jordan's history together was in Gun Digest's Holsters and Other Gunleather by Roger Combs. Is that your source or do you have more?

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Red Nichols The Holstorian

The very best source, in my opinion, is right from the horses
mouth, or typewriter in this case. Bill Jordan's column "How The
"Jordan" Border Patrol Holster Came To be". Shooting Times,
January 1984. I have also read Roger Combs article and many
others on this subject.

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In Omnia Paratus