Athletic enough for what?
Two will most likely have run responsibility and curl/flat coverage. The other will probably have to help over the top.
Need a safety that can take on lead blockers, yet still keep up with quick running backs (Sproles, bush etc) in the flat.
And then other safeties who are solid in coverage
Pryor is probably more than capable, but if he's the only guy capable then it makes his duties more predictable