I was not able to read the whole thread, but its seems to me that 99% of the people are not happy about signing Zebina. I think they are not right! Zebina was an error prone last season, but this year ha was great, ha always had the talent and all the physical and technical capabilities to be a class defender. He only had problems in his mind, but imo (I hope) he matured in that aspect.
So, I dont think we no more need a world class CD, but comparing what we got (Iuliano, Ferrara, Leg, Montero) a kind of player like him, was absolutely needed. He, or Leg could be partnered with a class cd, and our central deffensive problems are mainly solved.
And he is just 25, and for no fee.