Maybe I'm missing something about what the intended route is but.

-To reach Sunkeship's boss, you have to go through those golden octopus enemies that fireshots really fast, preventing you from progressing unless you facetank a lot of damage.

-On Coral Hill, after defeating the boss, you get Ruby, and a room towards Crystal Caverns shows you what she can do, that is, they put a bunch of those golden octopus enemies and with her ability you just go through no problem.

So one would think that you need Ruby to clear Sunkenship "normally"

But that's impossible, because to reach Coral Hill you need You, who is on the area AFTER Sunkenship, and there's only 1 route there.

On top of that, you can go from Sunkenship to Coral Hill...except for the fact that there's a door with 2 switches on the OTHER side of the room, so to go through that entrance you have to reach Coral Hills from the other entrance, wich requires You (And even then, I don't understand how are you supposed to open that door with 2 switches, not even Mari LT works there)

And sure, you don't NEED Ruby to reach the boss, but that means taking a lot of damage or getting creative with Kanan and Tonosama's LT

Soooo...Am I missing something in regards to that connection? Because it doesn't make sense.