Devean George? Quinton Ross? Are you kidding me? Those guys can't defend three positions like Posey does, are not nearly as tough as Posey, nor do they stretch the floor like Posey.
You can sit here and say "we'll sign a wing defender, we'll sign another 3 point shooter, we'll sign another tough guy..."
You're not going to find one guy who gives you all those things. Even Bowen can't defend power forwards.
Remember, the whole Lakers series turned when Rondo and Perk were hurt and they put Posey and House in and spread the floor with shooters. Again.....there is no one guy available that gives you everything that BGJ does.