On the surface, it’s easy to see how the “Meeseeks and Destroy” moment leads to what we see in “The Wedding Squanchers,” but some people require more convincing. Specifically, Redditor u/demon_ix broke down why the theory doesn’t hold up, saying, “Tammy was already an undercover agent working to infiltrate Rick’s inner circle. The guy walks around the universe telling everyone his name is Rick Sanchez. Do you really need to be any sort of detective to find him once you’ve traced him to Earth?”
If anything, the theory would only explain how Tammy became friends with Summer in the first place to the point where she would be invited to the Smith household party in “Ricksy Business.” She then could’ve used that party as an excuse to get close with Bird Person and set a series of events in motion to take out Rick and most of his criminal cohorts.
After all, Tammy knew Rick had to be nearby; otherwise, she wouldn’t have enrolled as a student at that particular school where his grandkids happen to also go. And if Summer never used Mr. Meeseeks to become popular, Tammy would’ve found another opportunity to befriend Summer or get close with Morty. But this is likely one development that doesn’t have much in the way of greater machinations at play.