I think it would be so funny if Obito without a mask showed up all cocky in civilian clothing or other shinobi village gear at whatever roadside restaurant Kakashi was in while traveling for a mission, completely confident that Kakashi, even if he recognizes and believes him to be Obito, would not allow himself to acknowledge it knowing the probability of this random Obito-looking-guy with scars in the right places actually being Obito, especially considering Obito in this situation is just sitting down having a drink and a snack. So, we have Obito hanging out munching on some red bean dango that Kakashi knows he loves, and Kakashi sitting on the other side of the room having an existential crisis.