The article says he offered first to work on holidays. I'd like to believe sick people don't take holidays off and doctors would probably be pretty busy on these days, just like any other.
Maybe the Jerk doctor in this article is fed up with stepping in and working extra to keep the business working and the reciprocity has dried up.
Yup. This was why I said it's difficult to distinguish a brilliant person who has little people skills from a jerk who's good at convincing others they're brilliant. And you're certainly correct to point out that this doctor could have been nothing more than a management scapegoat. I've seen that and lived it.
At the same time, I've seen people convince others that they're doing the business a favor by hoarding all the work, working long hours, taking credit for others' work, and building up systems that require their knowledge to operate. This is all well and good in a startup where you have few people, but it's murder any time you go beyond that.
Maybe the Jerk doctor in this article is fed up with stepping in and working extra to keep the business working and the reciprocity has dried up.