235lb RBs are not going to be the norm, and he's shown plenty of times in the past that he can bring down those big TEs if he has to.
As far as the INTs, yeah, he may not have 5 every year, but he seems to come up with 4 quite a bit. Kill him for that extra one all you want, since it's clear you have some sort of axe to grind here.
I don't even advocate the idea of moving him to FS yet, I still think he's got plenty in the tank to maintain his current position, but I forgot that unless the guy were to average 7 picks a year while never allowing a catch on his side of the field, while delivering hits to Brandon Jacobs-sized players in the style of Roy L Williams circa 2002, he's not worth a damn and should be cut immediately.
Silly me.
He's still the best corner on the team and far from the major issue in the secondary, let alone the defense.