The Chicago Bears were busy today, adding RB Daniel Thomas and S Sherrod Martin to the roster, while releasing QB Pat Devlin, TE Jacob Maxwell, and K Jeremiah Detmer. Perhaps the most significant result of these bottom-of-the-roster moves is that it leaves the Bears with one open spot on their 90-man roster. Typically when the Bears release a player there is a corresponding addition to the roster. Otherwise why would the Bears release a player who can be a useful camp body? The one exception is if the release was prompted by off-field issues and needs to be done quickly to avoid fan and media backlash (Ray McDonald).