S rank values, Endwalker

There is one new S rank value in EW.

Aetherochemical Spills: 293

This is a deviation from the prior S rank values being the previous largest AAA+0.2.

The largest AAA from HW (the only expansion with Aetherochemical Spills) is Allagan Bladeshark with a max of 105im.

EW has a fish which can meet this S rank value on launch, Lunar Deathworm which is similar to Listracanthus in regards to its maximum size being barely beyond that of its S value.
It is too early to say but it is possible that they might have the same amount of room between S-value and their apparent maximums.