Slim,
I really appreciate your point. I am sure it is good to think musically and then work to achieve that, whether it "lays well" or not.
I know when sitting in with a jazz group, and the tempo is very fast, I do tend to rely on phrases that are easier to execute. There is no way around it. Solo tuning will sound different than Dimi at that point, I would predict.
Even listening to Toots, I feel that, as a generalization, he goes with the layout at faster tempos and that he is freer to follow his whim at slower tempos. Maybe you're right, with many more players we might hear that there are infinite ways of doing this.
I assume that as we progress, pure musical thought merges with the practicalities of the layout/music/tempo in a seamless way.
I must admit that a good deal of my approach has centered around exploring how the Dimi layout intersects with tonality, and I've found it really fascinating. Perhaps this is a symptom of my relative newness to the harmonica and the Dimi - just trying to figure it all out.
In thinking back on the video I posted, I wonder if my phrases sound idiomatic to the Dimi. I think so, but probably not in a blatant way.
This is an interesting topic, and I will keep your point in mind.
Jason