Board Thread:Ninjago Wiki News/@comment-34330505-20191114235432/@comment-30499831-20191115181805

Chimadino wrote: Yes, that's why I said might. Also, if they just throw Garmadon into the void like that, without explaining where he is, then what's even the point of bringing him back, if they no longer have use of him? Ninjago's arcs are seasonal. Things introduced in a season won't always be relevant in the future. That's just how it works. (I.e. most villains in this show, and side characters even when they rarely appear)

The point of bringing him back (aside from the creators needing to align the show with the movie) was to serve his purpose as an antagonist in the Seasons 8 and 9 story arc, and eventually also appear in 10 once they had the opportunity to do something with the Oni.

I think he will appear eventually (not next season), but it's not like Ninjago is written with every season after it in mind. The fact that they didn't take the opportunity to kill him in 9 or 10 should show that they're saving him for later.