The thing is boxing promotion always creates manopolies and manipulations. It is the nature of the business at the top, even when it's all legal and above board it is and always has been quite cut throat. Somebody always has to be at the top, or appear to be at the top to maintain what they achieved. Knowledge and shrewdness are key. As a fan and as a historian I have come to accept this. It is not personal, it is just how it is. Every fighter should look for the best deal, trust only those who deliver, because everyone else does. Duff was a character. He had knowledge and shrewdness a plenty. One thing I remember from his book was anyone who was easy to deal with and reliable was great. but he hated anyone who wanted to negotiate.
Stumble back to the early 80s and read up on FW's entry to the sport and his battles with the BBB of C that went to court and helped change the landscape of the sport.
He was in the background in the sense of fronting the money. They all worked together in their respective roles,Astaire knew a good investment,Duff knew a good deal they had a great business partnership.
You might want to check how many times Buchanan appeared on Duff/Levene promotions. Try 28, that's in 69 fights. I only saw him on one myself it was at Wembley Arena 1981 an 8 rounder against Lance Williams.Buchanan floored him but lost the dec, his purse was £1,600 it was his second to last fight. Eddie Thomas managed both Buchanan and Howard Winstone, he never had any trouble getting Winstone top dollar fights.
Duff was independantly wealthy by the time the Cartel was well established, his association with Astaire went back nearly half a century.