I also think Iva is more of a CB.. he can't really handle with pacey players, sometimes he manages to use his body but it doesn't always cut it. He failes to block crosses too, he did it yesterday when Benteke crossed and it was almost a goal, another example is the match against Madrid where he let Isco cross to set up Ronaldo's header. You can't give players like Isco time and space to look for a pass \ cross.