I don't think he can and I don't think LDR would take him into that positioin. Specially, if you remember how Pepe had to play against Udinese. Gio couldn't do it.
But he can be a good SS option. :)
Krasic also didn't play well against Bari. It was also the first match so we have to give some time for Martinez. And I think he can be good as a LW, he has the speed to fill this position.
I saw him against Wales in U-21 team. I think he was great. He defended well. There was a clean sheet against Wales, of course not only because of Shcelotto but still. He usually support the attack with some fine crosses. He can be a great player.
I think it's not Puyol who pass the ball out of defence but Pique. He usually goes forward changing with Busquets.
I don't think he was "calm" earlier than Chiellini will be. :)