Madden might need a positional familiarity rating or something. Just like in baseball games where a 1B doesn't necessarily play good SS because of the demands of the positions.
That said, OVR is just an arbitrary rating. It probably needs to weight coverage much more highly for CB/FS/SS, but it doesn't really mean much, imo.
Might be rated too highly. I don't know what his ratings are (don't usually look at 37 year old FAs).
If Brooks could play good safety on the field, that would be a bit of a problem, though he probably could in a 46 package as the SS plays the "4th linebacker" a lot of times.