Dwight can set Ryan up with the worst techs, cut his hours or his help hours, and generally harass him with microaggressions within the limits of constructive termination if upper management doesn't care (and if they really are MIA, then past the limit of constructive termination and dare him to try to go up, it goes both ways). Dwight can forcefully write him up for any errors and KPI him into a mistake, hopefully one that pisses off the customer but doesn't hurt or kill anyone. Dwight doesn't have to accept sick out without a physician note either in most companies and force him to go through the FMLA process with his supposed MSG and peanut allergies because these are avoidable. Basically, set up a hostile work environment for Ryan to make him exhaust his vacation, then put the FMLA squeeze in.
When upper management is really out to lunch, take the opportunity presented to clean house. In fact, forcing Ryan into an error and calling the State Board on him is a time-honored story from the old days when Ryan just isn't hacking it.
