This is also from the interview:
"As far as being a part of the team he wasn’t because he didn’t really understand anything that we were doing or why we did it. He was kind of along for the ride. But still it was a good ride and he enjoyed it, but being a part of the camaraderie, he had nothing to do with that, which was a shame, but it was what it was. “He went from having an IQ of about 175 to 68. It was very limited the kinds of things he enjoyed."
I'm sorry, but Dean is just an asshole. An IQ of "68" actually indicates mental retardation. So, Dean is saying that Jan was a retard after the accident. It's amazing how a retard was able to produce Carnival of Sound, Second Wave, Port to Paradise, all those 1970s era singles, plus write all those songs after the accident.
Someone should tell Dean to shut the hell up. I mean, I am sure he knows, as we all do, that without Jan he would have become NOTHING, certainly not a famous, wealthy rock star (who continues to live off of Jan's legacy). From reading interviews with him over the years, Dean sounds like a non-reflective, closed in person who has major problems handling any kind of emotional intimacy. He lies about the past, and twists things to his advantage. And its become worse and worse over the past 10, 15 years. I think he just resents the fact that Jan, his meal ticket, got into the accident, essentially ending the creative part of their career. And once Jan became brain damaged, emotionally damaged Dean had no idea how to deal with him, so Jan became a "retard" to him.