Probably said it before somewhere on here. But saw Kovacs in person a number of times around his peak (i would guess). Having seen Richards also about a few years or three earlier (who was amazing enough) I would have to say that Kovacs was almost unbelievably big. At the time I saw him I was around 280 pounds at 6 ft 4 and he dwarfed the shite out of me. I would say I was about the same height but he was so big that I had an attack of bigorexia. His arms were insanely big - definately bigger that Vic Richards - and as for the 'having someone wipe his ass' bs - what a crock. The guy was entirely functioning and I watched him do a few workouts where he had no problems with full stiff leg deadlifts, good mornings etc etc. He seemed like a perfectly engaging normal sort of dude as well - in fact when he was at his best he was exactly how he came across in the interview with Palumbo. I do remember he constantly had a mini fan with him aqnd carried a 4L jug of liquid with him and was constantly drinking it (if I remember correctly he said he was getting over a bout of flu) but to be honest I think the amount of gear he was on would have made Louis Pasteur catch the rabbies.
One more thing - doubt that he was 400 pounds but no trouble believing he was well over 300+ in good shape. I had a mate a little shorter than myself who peaked at around 340 pounds with i would guesstimate 15-20% bf (he had decent abs at the time) and Kovacs was significantly bigger than him so 360-380 pounds or thereabouts seems entirely reasonable.