This assumes Teach HAS to be relegated and defeated at his own island, which is not true. Fullalead isnt a kingdom with its own problems. Luffy doesnt need to "liberate" the island from anyone. The Goal for the Yonko now is directly One Piece, not sitting on an island for no reason. This means everyone should be clashing over the 4th RP somewhere else.
The only actual reason I see him going there is to save his Grandfather, but the story even implies that Garp is just missing, not explicitly captured and Imprisoned at Fullalead. Its also not like BM went down in Whole Cake Island either, she lost somewhere else.
And even if that were the case, I would sooner expect a Garp "arc" to be more related to Aokiji being the antagonist over anything, which I just doubt.
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@Rocks D. Buggy Though I think Elbaf will be significantly longer (with its own issues), I agree with this mindset.
We technically also have to consider Law's island after Elbaf. It wasnt Winner Island and now since Elbaf is the next location, i.e. Kid's route, it makes sense that we at least go there to potentially start the 4th RP plotline (assuming Elbaf doesnt)