You gotta realize that thre's the musical self & the personal self (and many other selfs if you really want to go there...). The musical Joe - and quite often enough, the professional Joe - had their shit totally together. The intellectual Joe too, for that matter. But there was another Joe, who had....that thing. Those selfs only sometimes intersected, which is why we all know of Joe Henderson The Tenor Player today and don't let the demons define his image (unlike some others who either couldn't or didn't keep it private, for whatever reasons) . He kept his shit together and private enough that the "general public" never had an inkling, which, really, is how it should be done if at all possible.
This is just another way that Joe proved to be music first, everything else later. Serious people are not immune to problems. Joe Henderson the musician was a serious man and should always be thought of as such, no matter what. Anything else would be a mistake.