The real question is Why?
Why would Scott so suddenly just cut off contact with the DeLeos, stop answering their calls, and go out on a Purple/Core tour on his own for less money, fewer fans, with FAR less talented musicians. The only reason that makes sense is he was slipping back into addiction which the DeLeos would have (rightfully) judged him for, and the Wildabouts would not because he is their meal ticket. It still makes no sense why he would choose to do this so coldly to people he's called family and owes his life to. There had to be some sort of argument or catalyst that caused him to drift so curtly.
Either that or he was so dead set on doing his own thing that he didn't care to give his old friends the time of day. I'm still going with Option A.