My theory abt what happen In Misako and Garmadon's absence.
Immm gonna give a benefit of a doubt that the reason why Misako and Garmadon were both absent around season 11-12 (Misako was the one absent until season 13-15, while Garmadon was until season 15, also it's canon that the GARMADON comics took place between Season 10-11)
was bcs Misako actually manage to find / locate Garmadon, after his journey from the Two Moon Village in the 'GARMADON' comics..
Let's say THAT reason is canon for now (allegedly). At some point, Misako manage to locate Garmadon. But what is her specific reason to? The last time they encounter was in S10 Finale, and it doesn't even seem like much of a friendly interaction either..
Was it curiosity? Or perhaps she's just going on another one of her research for the Explorer's Club while also looking for Garmadon as a "side quest"?.
Then eventually Misako return in the series in MOTM S13:
For some reason Lloyd and Wu looked a bit surprised that Misako is present. Yes, she could just already been around and just chimed in, but.. I like to believe that since she was previously absent, THIS scene is exactly when she returned, she was JUST done with her re-search and encountered Garmadon. And from there Misako is a recurring character again throughout season 13-15.
Then in Crystallized, Misako apparently "found something" that might help the Ninja to face the Overlord that time, a prophecy which she found while she was in the Library of Domu. But what if these studies that she had been doing wasn't just throughout crystallized? What if it's ever since she found Garmadon again? Maybe Garmadon informed her about how he can sense that the Overlord is building up his comeback, like how he's been alarming Wu through the news paper clippings?
Wu stating that these clippings had been sent to him for "months" could be a clue on how long Garmadon had already been living with Vinny. We all saw he was scattering around Ninjago, scaring away everyone that he walk past through, but we never saw how he even KNOW the address of Vinny's apartment??
The only time Vinny's address was ever mentioned in the series was in a scene at the Newspaper Warehouse. Maybe in his non destination stroll and unhelpful attempts to help ppl around across Ninjago lead him to the warehouse. That's probably how he found out the whereabouts of "possibly the wisest person he ever met", so he came to Vinny's place, looking for infinite wisdom.
Wu mentioned that it has been months that he got those clippings... it's possible that Garmadon lives with Vinny for the past few months, still pretty recent, so he probably remained homeless for a LLOONGGG time ever since his stay in the Two Moon Village in the 'GARMADON' comics
And after the events of 'GARMADON' , both him and Missko are absent.
Then eventually, they encounter each other again off screen.
But that's just a theory! A GAMMEEE THEORY
