I always thought that Nana's performance earlier in the season was only part of the reason for his lack of playing time. Once John Molinaro broke the story regarding his contract situation, it seemed logical to assume that Winter was trying to send Nana and his agent a clear message. I didn't berate Winter's decision at the time because regardless of the circumstances, Cann and Williams deserved to start ahead of Nana based on their form.
However, at the moment, Nana is number one on the CB depth chart, and in Winter's case, I hope logic prevails over principle.