I didn't see the presentation, but I did see a "Keef" interview about 2 or 3 years ago...done, as it happened, in a bar..where I'm sure he was very comfortable.  His speech did sound disjointed and slurred ( I assumed it was the drink), but his head and neck were doing a lot of Jack-in-the box gyrations that have been called "titubation" in Neurologic terms.  This type of movement is noted most prominently as a "cerebellar sign", meaning of course that it is due to cerebellar dysfunction.  Could this be alcohol induced cerebellar degeneration? Perhaps, but that usually affects balance and leg function more.  I see it more commonly in patients with MS.  Keith certainly could have MS, and just not have revealed this to the public.   I think if you throw enough toxins at the ol' bod..things eventually go wrong, especially with multiple brain insults, as in his case (again if their is truth about his past/present intake..I have it on good authority that he is still quite the demon).  

Gene