After Kuiil mentioned the Mythosaur in Chapter 1 of The Mandalorian, fans had a sneaking suspicion that the creature would play a role in the show's plot at some point. Fast forward to Season 3, and the Mythosaur debuted in "The Mines of Mandalore." After Bo-Katan saved Din from drowning in the Mines, she encountered a Mythosaur in the water on her way out. The sight left her in shock, and she didn't tell Din what she'd seen.
As the season went on, Bo-Katan told The Armorer, who decided that Bo-Katan was the chosen leader all the Mandalorians needed to rally behind. It appeared that the Mythosaur served its purpose in bringing the Mandalorian people together. Fans continued speculating about when it would make another appearance. Some hoped either Din, Grogu, Bo-Katan, or Boba Fett would tame the beast and ride it in the Season 3 finale. But that's far from what happened, as the Mythosaur didn't play any role in the re-taking of Mandalore.
But the season didn't end before fans got another glimpse of the creature sitting peacefully in the Mines after Grogu seemed to have felt its presence. This convinced most fans of the obvious: Grogu would eventually tame and ride the beast. That's very possible, and it makes a lot of sense, too. But then there's the unresolved matter of Din Djarin, who has no idea there's a Mythosaur on Mandalore. Bo-Katan never told him, neither did the Armorer, and Grogu is too young to say a word.
This leads us to the question of why Din Djarin is unaware of the existence of the Mythosaur. It's possible that the title of "The Mandalorian" could be referring to Grogu, who appears to be destined to ride many giant creatures and deserves to rule the planet for hundreds of years. However, the Mythosaur was first mentioned on the show by Kuill in a conversation with Din, who doesn't know that when he nearly drowned in the Mines, a Mythosaur was just a few feet away from him. Might it be possible that Din, a guy who wasn't born on Mandalore, is meant to encounter it unknowingly?
Is Din Djarin only destined to be the guy who helps others achieve glory, or is he meant for something more? After all, he's watched his friends like Boba Fett, Greef Karga, and Bo-Katan getting promotions. So what is his destiny? Isn't a man who's so devoted to the Way of the Mand'alor good enough to tame and ride a Mythosaur? Riding a Mythosaur doesn't necessarily mean a person will become Mand'alor. According to The Armorer in The Book of Boba Fett Chapter 5, a "Mythosaur will rise to herald a new age of Mandalore."
Maybe the Mythosaur's real purpose will be fulfilled after the start of a new Age of Mandalore, heralded by a different Mandalorian. Din Djarin seems like a great candidate to do this because of his staunch devotion to The Way of the Mand'alor. He has displayed many leadership qualities and brought out the best in everyone around him. Above all, Din has no qualms about working with Jedi, or anyone, for that matter. He's raising a force-sensitive foundling who will probably become the greatest Mandalorian Jedi, and he's always been ready to help others.
Din represents the best of Mandalorians. If he rides the Mythosaur and becomes the symbol of a new age for his people, it will be the cherry on the cake for his character arc. He's someone special, and it's about time he got the chance to show it.