On the other hand, his sound as a soloist on an ensemble doesn't move me.
That's an interesting comment.
I will tell you my side of the story. When I was new to djembe, I liked (or understood) the soloists who stayed within the melody of the rhythm and filled it up with variations. That was the level I understood west african music then. Now, I also like and understand the "going across" soloists, ones that go right acroos the rhythm, thats what I have started grasping now in WA music. Its a journey, I think you see some things only when you have travelled till there.
Coming back to your comment, I am still young in this music but I think that Adama is one of those "going across" soloist.