Also, right in front of your case saver, on the case itself, there is a little divet on the case itself. There is supposed to be a plug there so when you put your cover back on, you don't get crap from your sprocket/chain into your flywheel area. You don't have that plug and it looks like you are getting stuff into your flywheel area, hence the darker color, like oil and grime.
I would make sure that is sealed back up when you put your cover back on.