Hm, this is a bit tricky now. 14, 15, and 16 are vital. That adds up to a lot, but I don’t think the season wants to be stretched over two movies - I think punchy and tight is best here.

1 introduces Phee, which might be enough with just a little of 13 to get enough of Pabu in the story.

11 can probably be trimmed to just the Nala Se focus rather than getting into the Zillo Beast.

Ideally it would be this -

Open with 1 & 2 (trimmed), intercut with 7
Transition into 8, but minimise the impact of Echo leaving
Overlap all of the above with Crosshair’s story from 3 and 12
14, 15, 16 to conclude
Pepper the necessary Nala Se and Pabu scenes throughout to make the whole work.

But that makes 4 hours. On reflection, maybe that forces this into two movies.

Maybe instead it’s-

1, 2, 7, 8, with crosshair’s 3 and Nala Se’s 11.
12 (crosshair) and a little Pabu before 14, 15, 16. Maybe a bit more of 11 to give the Batch something relevant to do earlier.

Those would be a little under 2h each.