That’s pretty clearly the arc they’re setting up for him, especially having him finding the glasses and start questioning himself right next to the Maulers cloning part. Their whole thing is they don’t know who the clone is and who the original is (and in all likelihood, the original is lost to time and they’re both clones of clones of clones). They didn’t really have much of a story this episode, so it was more to set that up as a parallel to Donald where, like them, he starts to question if he’s real or not and, again like them, probably has been replaced several times over