Okay. So the guy who made the video essentially has a pet theory. It says that the running theme of the show is the idea of parallel universes. In many episodes, it's shown that Rick and Morty belong to C-137. But in many other episodes, it's not. Which means, we're not even sure if we're following the life of the same Rick and Morty. It could be different R&M for different episodes. For example, in a particular episode, Rick gives some sort of goggles to beth,jerry and summer, that match their DNA to find an alternate universe. And two episodes prior to this episode, after destroying the world, Rick and Morty use the same headset to hop dimensions to find a universe that has matching DNA as theirs.
In season 1 episode 10, with the Rick counsel, the counselor points to c137 Rick and says he's the malcontent in a central finite curve. The guy's theory is that, the central finite curve is a subset of the useful Ricks that are genetically matching.
It's also to be noted that c137 Rick lies exactly 2 places ahead of "Evil Rick" in the evilness "spectrum". I'm not able to explain this part clearly but I'll try to find a picture for you soon.
In s2e2, C137 R&M leave Jerry in a Jerry daycare center and it's clearly shown that Jerry fills c137 in the sign up form. After leaving Jerry in the center and getting a ticket for acknowledgement (#5126), we're shown a Rick and Morty who blow up a place and commit a crime when Morty tries to save Fart. When Morty kills Fart and returns, Rick is shown picking up green crystals from that place. These green crystals also feature in another episode- the parasites one where Mr.poopy butthole is shot by Beth.
Now let's return to s2e2. At the end of this episode, it's shown that a pair of R&M come to the R&M who killed Fart-who are featured in parasites-poopybutthole-episode- and ask if they have #5126. Which means, this whole time, whatever we saw- Fart R&M, Mr.pbh R&M may not even belong to C-137!
Ps, I'm not sure how much I got right.