Not strictly true mate, as the Top DJs drove to Soul Bowl and got access to things that John didn't list. Most of the top DJs were all regular visitors in the 70s and 80s. What would happen is that there would be small piles of discoveries that John would prepare for each DJ to listen to. As a humble youngster, broke and living in Peterborough, I went with Soul Sam a number of times and we had seperate piles to listen through. Sam obviously got the rare stuff in his pile, and invariably I got what John thought would be some good £1.50 type soul sounds. This worked for both of us, as I couldn't afford the rare stuff and had a wife and hungry kids to feed.
Over the years it has been said that there was a pecking order for DJ's and in the late 70s I think you can evidence by his playlists at Wigan, Searling got first call on new discoveries. Then it was Poke for a while, Sam with modern, Butch with 60s etc.
So I'd agree that John has discovered more than anyone. Of course he didn't discovere everything and no one is suggesting that.
As to DJ's again it's a timing thing - Searling was streets ahead in the late 70s / early 80's on new 60s, but since then?
Sam has also had a long run as he has just kept going as Brian says. More recently the crown would go to Butch. I'd also single out for special mention people like Arthur Fenn, who has always been at the progressive end of northern, Dearlove with the slower stuff, Ady Croasdell, Andy Dyson for 60's etc.
So what I am saying in a roundabout and long winded way is, there isn't a single person that stands out since 1968, but Sam is certainly up there. Though again fair to say he hasn't broke too much in the last couple of years.
So the principle that best reflects this (and again not always true) the dealer discovers them, and the DJ breaks them -is that a fair compromise?