He'll be active this weekend, but yeah like T said they only care 2 QB's and Lefty is the younger of the two. If anything Charlie is more of an advocate and friend to Ben than anything else these days. he can still play if he has too but he's lasted this long because Ben is so tough and generally reliable to be there on gameday.
Last year and then again this year a serious reminders that we have to upgrade our backup QB position. Seriously.