Bengals safety Taylor Mays has worked primarily with the first-team defense at strong safety -- or the spot otherwise known as not where Reggie Nelson is playing. However during practice when the team shifted from a base defense where Mays is settled comfortably as the strong safety, to a package expecting a pass (such as nickel), Jeromy Miles replaces Mays in the secondary.
It does appear that the competition at strong safety is either ratcheting up between the two, or that the picture is becoming clearer on how the depth chart will look. Mays the starter with Miles the backup, as well as a pass coverage specialist. Though Mays has has even held his own against tight end Jermaine Gresham tweets Brennen on Friday during Cincinnati's practice.
Though as Geoff Hobson points out, George Iloka "continues to be an intriguing factor".