Why Groot Was Able To Do THAT At The Very End Of Guardians of the Galaxy 3 (Theory)

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Warning! This article contains spoilers for Guardians of the Galaxy Vol. 3.
Toward the end of Guardians of the Galaxy Vol. 3, Groot talks and says something other than a variation of "I am Groot" so we break down a theory of how that's possible. Ever since his introduction in Guardians of the Galaxy Vol. 1, Groot has only ever said, "I am Groot." When Star-Lord asks Rocket about it, the raccoon tells him, "Well he don't know talkin' good like me and you, so his vocabulistics is limited to 'I' and 'am' and 'Groot,' exclusively in that order." Groot's limited vocabulary is played to great comedic effect often, including when he meets Captain America in Avengers: Infinity War and Chris Evans' hero replies, "I am Steve Rogers."
Though the audience and Steve Rogers may not speak Groot's language, certain characters in the Marvel Cinematic Universe do. For example, Thor can understand what Groot says upon first meeting the tree-like creature. In the latest film, all the main characters except Gamora can understand Groot, and by Guardians of the Galaxy 3's ending she learns as well. It's at the end of the movie when Groot speaks English for the first time in the MCU, saying, "I love you guys." There are two potential explanations for why Groot speaks for the first time, though one is perhaps more likely than the other.