I don’t understand injury report strategy

Apparently a lot of coaches think the smart thing to do is to “withhold injury information”:http://collegefootballtalk.nbcsports.com/2012/09/20/lane-kiffin-supports-a-uniform-injury-policy/. Others “spew out injury information at the drop of a hat”:http://www.cleveland.com/buckeyeblog/index.ssf/2012/09/injuries_injuries_though_some.html This seems obvious…