Letang is an amazingly talented X factor who needs a head coach who can lay the smackdown on him. Bylsma wasn't that guy, I doubt Mike Johnston will be that guy, but Patrick Roy would be. In French, even.
O'Reilly is a Jonathan Toews clone who can score and play wing if need be. He can be signed for less than Letang. He and the Avs front office hate each other.
Plus, can anyone say Three Center Model?
Throw in Avs D Holden and Spaling's rights to even things out. Then the Pens ca trade Sutter's rights if need be, like, say for D Matt Bartkowski or somesuch.