Redditor u/Blucrasher posted a theory that Lumon's middle manager Seth Milchick "lives next to Dylan's outtie the same way 'Mrs. Selvig' lives next to Mark," referring specifically to the Episode 6 scene where Milchick uses the Overtime Contingency protocol to wake Dylan's (Zach Cherry) innie while he's at home. "This would explain how Milchick got into Dylan's house, why Dylan's kid would listen to such a crazy instruction (count to 1000), and why his outtie didn't freak out. Milchick is probably a family friend of Dylan's outtie."
While u/ConsiderationWise631 quickly debunked the theory, pointing out that the outties recognize Milchick as a Lumon employee, the question resulted in a discussion with more than 50 comments, including other far-out theories. Several comments mentioned the employees all know Milchick inside and outside work, so he's not pretending he's someone else. u/Memoruiz7 put forth their own theory, that "Irv used to hold Milchick's position," which u/btherese77 took to an extreme by noticing they're the only ones with mustaches," though that was also quickly debunked by u/kings_lead_hat mentioning Dylan's full beard and mustache. u/Dinierto also stated their intriguing belief, writing, "My thought is that everything is an experiment, and when it fails, they are wiped and start over."
Perhaps the most fun theory stemming from u/Blucrasher's original post is that Dylan and Milchick are domestic partners, and Dylan is their son. "If that turns out to be true, this show will jump from amazing to all-time great," replied u/Al_Redditor.