The discovering of a record varies in importance hugely. in some cases it would be inevitable that the record would be played and appreciated so the discoverer should just get a nod of approval. In other cases it may be an unusual sound that takes a hell of a lot of breaking as its style of soul hasn't really been played before, in that case the DJ that picked it and stuck with it deserves a lot of kudos. Similarly if the record collector/DJ had to risk his health in a rough neighbourhood to acquire a super-rare record that might otherwise have eventually got destroyed then he has done a major service to the music and the fans. Or it might have taken great diplomatic skills to persuade the owner to part with the discs so that they became available to the general soul public.
Lots of scenarios (I'm sure there are many others) and the DJ's dealer's or collector's back slapping should vary according to the job done. But obviously the overwhelming amount of kudos goes to the artists, writers, producers, arrangers and label owners.