if the artist in question is entitled to royalties--and that entitlement is determined by contractual agreement--all he has to do is let me know and I'll make sure he gets his royalties from anything CAMSCO sells.

It's fairly obvious that there isn't any sizeable market for old Leader recordings--if there were, I'm sure Mr. Bulmer would have issued them. Unless you believe that he's holding them back, and losing all that income, just to be spiteful..

Leader re-issues are a trivial part of my annual sales. I carry them because a few customers want them, and because I hate to see good music become unavailable.

"It had been sneaked out without even telling him, and NOT by the producer but the current rights owner.
Why no publicity? And, indeed, why no mechanicals payment following the release?"

Well, the current rights owner, by definition, is the one who currently owns the rights. Mechanicals generally refer to automatic payments to copyright holders by folks issuing cover recordings..not applicable here. As to why no publicity, I have no idea. It certainly can't be attributed to motives of greed by CM.