Hours are meaningless; I know 500 hour guys who are quite capable in the RHS of any of the above types, and 10,000 hour guys that I wouldn't sit in the back if they're up front in either seat.
Attitude, knowledge and skill are what is needed; experience adds to that, but there is no benefit to spending 20 years practising being a cowboy.
Noneya, if you think having two 9k+ guys in the cockpit adds to safety I suggest you start your reading with the GIV at Houston that was on its way to pick up Bush Snr and carry on from there.