For those who follow NHL hockey, let me make an example that to me is a bit like Portnoy's story. Montreal's P.K. Subban was outspoken, flashy, very popular, totally dedicated to his team but also his own enterprise (clothing, advertising), the spotlights were often on him. He surely made some of his teamates crazy, he never slowed down, probably close to take ritalin, making some teamates jalous. Subban probably was annoying the management with all his outside business and schedule being heavy but he was one of the few players giving always his 100%.
So, some of that is like Portnoy who had multiple things outside DT that certainly bothered the other guys and I don't think he was really getting along very well with one or two of them.
Portnoy had a lot of qualities but not necessarely fun to be around since the focus on DT was different than his bandmates.
I don't know if you get my drift, Subban's personality and MP's are wild. Sometimes you have got to go with a change and both stories have something in common.