Re: If Daryl or Rick died.....
I don't think you can lose Rick. Everyone else is probably at least a little expendable, but Rick is the heart and soul of the show.
Casting for Marvel's NETFLIX shows:
Daredevil: Ryan Phillippe
Iron Fist: Philip Winchester
Luke Cage: Billy Brown
Jessica Jones: Michelle Monaghan
The Punisher: Holt McCallany