DE’s reasoning for making him corrosive is that salt water is “corrosive”, for wood and metal specifically and that takes months to decades to see some real damage.
This does make sense for armor stripping but putting salt water on par with actual acid ... That's a bit of a stretch.
Tying a pirate's “identity” to acidic saltwater opposed to their leadership, ingenuity, marksmanship, and swordsmanship as an adventurer is even more of a stretch.
Let’s all pretend we shoot/melee the enemies our “pet” kraken is holding, and we don't hit a single tentacle. Regular hydroids tentacles are water, prime has a form, and you comparing a 4th ability to a companion instead of a tool just to criticize a gif is wild. But by all means please go out and look for or even create a gif where a pirate is using both a gun and sword that the forums interface will allow you to post.