Well even you have to frigging admit the Brazilian defence easily trumps Italy's (in quantity and quality, in depth). You are right in Gamberini being close to Naldo, even if I prefer Naldo from what I seen, but come on man, Santon is only younger, Marcelo is defenitely better (weak defending, but great offensively, he is 3 years older, and defenite excellent talent).
And Thiago Silva certainly trumps Criscito and is the better CB, Criscito who is barely average as CB (doesnt cut it there, not for US and not for Genoa, liability as CB), but quite decent/solid as LB (even if off this season). And no, not only because they are attacking, Brazil blows Italy out of the water in FBs (Grosso and Zambro can defend for shit now, Grosso never could), in fact they pretty much revolutionized that positiion so no one comes even close (except frenchies).
The Filipe I mentionned is the very good LB of Deportivo, not Fiorentina one (isnt even on the C squad of Brazil), who btw is quite capable at defending.
I'm the one who gives leeway to Cannavaro due to experience and reading the game well despite his decline, but he is pretty rusty and slow, so even if I havent seen Alex in a while, would prolly choose him over todays Canna.
I named those names to remind you of their selection (Cris for example, you prolly havent seen, but has been really good for quite few years now), which is easily better then Italy's current one. Not because I rate them all highly, Luisao I rate the lowest, and he is still prolly on par with Italy's 3-4th choices, but just saying they quite excellent seleciton of defenders, and you should show some respect instead of deem brazilian defending crap when its the contrary (seen Dunga's brazil? Their defending is ace).
Their depth for some years has been to a degree that Pepe wasnt a priority which lead him to choosing Portugal out of silly impatience. Players like Alex, Naldo and several real good FBs never even get called up. While in Italy, Chiellini cant find a single partner who helds similar level, and for FBs have to try out every joe with italian passport in the league, from Napoli, to Genoa, to Palermo etc etc.