I just jumped over to OSX from Windows this past summer. Since getting my rMBP there have been a couple of updates to OSX (ex. 2.0 graphics update, EFI, ect.). I had an issue and had to do a clean install this past weekend. After doing so these updates were not available. I'm assuming updates are incorporated into OSX as they are released, and subsequent downloads of OSX already include them. Is this the case?