I don't know how anyone can say Jankulovski's defending is awful and after that say Abate is good enough.
Abate is JOKE in defense, even Beckham is better than him. We all saw the first Genoa goal, when he need to position himself, he's like headless chicken. And I don't even want to talk about his tackling, we all saw it against Napoli. Jankulovski, though bad in defense, he can make a good timed tackle sometimes and can position himself at least in easy situations.
I'm really afraid of Abate playing because Juve have two VERY dangerous players on the wings (Marchisio and Salihamidzic) when late runs in the box and getting at the end of a cross is in question. I'm sure they'll exploit ANY positioning mistake by Abate. I thought Abate can be good SB, but I've changed my opinion, he really doesn't have any talent in positional sense to be good side back, though he have great attacking potential.