And a veteran of how many years on the road? And how many more years on the road were to come (and a lot of them with Benny Goodman!)?
After a while, some guys erect a bulletproof musical shield around themselves, just to keep going in a functional manner. Not saying that's what Zoot did, necessarily, but I've seen it happen more than a few times, and Zoot at 31 had a LOT of miles under his belt, figuratively and literally.
Plus, I wonder what part the realization that his type of playing was slowly but surely becoming "passe" (to use an overly broad word, but not as it applies to the popular taste of the time) played in whatever retrenchment, such as it was, that happened. He had to sense that his musical "youth" was over, and that does wierd things to people sometimes, too.
As for Woods, I have no excuse, and neither the need or inclination to look for one. But as I've stated elsewhere, I think he remained an involving player until roughly around the time he returned from Europe. A DIFFERENT player, to be sure, but an involving one nevertheless, one in whose playing I hear a lot of tension and inner turmoil, not doubt not a little of it coming from the musical double life he was leading and how that played off of what he no doubt started out wanting to be. But after he came back from Europe and accepted his position as "Great Jazz Altoist" and cut out all the musical tension in his career, I think he got just plain silly.
No comments on the Fathead/Zoot similarity? It struck me when I was listening to Zoot's solo on "On The Alamo" from the Benny Goodman Moscow album a few years ago. Their phrasing impulses (which is what I call how, when, and where, a player decides when and how to begin, end, and shape a phrase) seemed quite similar, and the more I thought about it, the more I heard it in other places.