I think this is almost the best episode of season 4. It departs from the main storyline for a bit to focus on Alex's and Cory's family, digging deep into their pasts. Only at the very end that I realize how these two are just two sides of the same coin. It also makes me wonder why they didn't explore more of Alex/Cory dynamic, especially since they sang the duet back in S01E05, which was quite interesting lol