Question: Is lito the CB that we should be trying to trade?

This weekend on the NFL network they had two of the eagles games on, as I watched them I started to see something. Sheldon Brown and not Lito was consistently getting burnt through the air. I mean lets take some time to think about this for a minute, everytime we play the G-men, what does Plaxico do to sheldon? And against the hated cowboys, what does lito do? Not just those games, but it seems to me that Sheldon, ( who hits like nobody's buisness) is sort of a liability at corner and maybe might be more suited for the SS position. At the start of last season there were rumors going around that if he didn't play better then he could lose his spot to William James. ( Not to even say that would be possible) but that was a topic they talked about on CSN. Don't get me wrong I would like to keep both of them on the team but it leaves me to my question, Who is really the better CB? LETS TALK ABOUT IT...........