This would presume that the person doing the firefighting is the original author of the software. That you're always on call specifically for your own code. In

This would presume that the person doing the firefighting is the original author of the software. That you're always on call specifically for your own code. In most ops roles, Dave would be fixing someone else's broken-ass system, and anyone else in the rotation would have a similar number of "incidents" against them.