The way, I see it, is that he didn't follow Supertramp back in England, because his life was in Munich - where Supertramp was formed as Daddy.

He played in a few groups (including Emergency) during the 70's, all based in Munich and I think I read somewhere that his lyrics to Wetton (for Crimson) were sent by post.

Then he made Jack-Knife with Wetton in 79 (I suppose this was after UK folded)

Anyone knows more?