The role Rob Stewart played should had him become
a regular and work along side David and Rachel in
Rob played against characters he usually plays. He
needs to come back and maybe play a Doctor who
helps solve these puzzles.
Dr. Cove only wants to help because of what happened
to his daughter, but they made it like he wanted to
kill off anyone who used needles because they
were drug users.
No doctor who seemed as honest and dedicated as
Dr. Cove would kill people. They should had made
his nurse Meghan the one doing it.
I hope we see more of Rob in Regenesis episodes, not
as Dr. Cove because of what happen to him. Maybe another character he is used to playing.