Still think of the collaborations as bonuses! I mean, if it wasn't for MK in the early days, I would have found out about Willy Deville, Randy Newman, Steely Dan, Aztec Camera, Gerry Rafferty and some more, much much later! I was introduced to all these great artists through MK and I enjoy them very much. May I suggest listening to Steely Dan's 70ies work. They are just a class on their own! Each album a masterpiece and I guess MK got something from them: caring about detail.
I was very surprised to see or find out retrospectively, MK collaborating with some of the musicians I already had in my collection, such as Jimmy Buffett, Dandy Warhols, Kate & Ann McGarrigle, Bob Dylan, Eric Clapton, John Fogerty, Phil Lynnott and others. I wish he had an official recording with Steve Miller, David Gilmour, Gary Moore, Darren Hayman, Stuart Murdoch, Tom Verlaine, to name just a few.
And don't forget that Buddy Guy contribution and the 2 Jools Holland pieces. Great!