Well, my take is different. Although previously I have tried to explain the term "band" within purely a live setting, i guess in a lesser extend, but probably equally influential, it stands for the studio recordings. Every album in their catalogue is quite different, even the first and second that most people consider that is in the same vein. The departure of David might not be considered as being the reason for the change in style of Making Movies, but then was it the producer Jimmy Iovine or MK deciding to change the sound by adding keyboards and making the compositions longer and more sparse? And the Love over gold album, was it just a continuation of Making movies to the extreme? And Brothers in arms, was it only MK trying new technology? I think that even with the strictest control of a person, the influences are always coming from outside. And many surely come from the other members of the band. MK is the composer, so he has first and last say, but all players contribute in the overall sound, even by contributing ideas that are not used. As for the solo records, especially after Shangri-la, I only have to say that there is a different take of the world and what you create, when you reach a certain age. I guess you see things in a more laid back way. An approach that is seen with many musicians, is going back to their roots, before the time they were successful. Maybe MK is doing just this, having no reason to prove anything to anyone, just doing things he likes, not even hoping we will like it as well, which is the most sincere and pure way to create something.
Jack Sonni wrote somewhere that he had learnt many things from MK but also MK got a thing or two from him. I think that having the need to mention this is revealing more about the subject than we can ever imagine. The interaction among musicians is the magical thing we can hear when it works. And with DS it worked a lot.