It's very common for lawsuits to name everyone that is even tangentially connected to the case at hand. It's a bit of a "throw everything at the wall and see what sticks" approach. Typically, the people who don't really have anything to do with the case are dropped very early in the process.

I know this from personal experience: I've been named in a small number of lawsuits over the decades because of this sort of connection. I've never once had to lift a finger about any of them. My name was always dropped from the suit in the first go-around.