I disagree with your definition of Tim Drake.
Yes, his parents were eventually killed, but everyone knows that his defining quality is that he wasn't driven by trauma and vengeance like the other Robins. When he first became Robin, his parent's were still alive (or at least his father, I think his mother was either divorced or died of sickness). He's there because Batman will always need a Robin.
Barring the guy you chose for Jason, I agree with the list.
Though I think Brody should not bother playing Robin anymore, he should go straight to Nightwing.