My most elaborate splatoon headcanon is that sheldon’s grandfather was/is still alive and in that octo expansion facility and i compiled proof and reasons why
Ammoni is a weapons maker. Perhaps after sanitization (can it work on non ink creatures?) he made weapons
Also horseshoe crab blood is crazy. Currently its used to detect toxins in medical equipment. Due to the phone guy being set on making the ultimate race (his words not mine) perhaps he wanted to use this blood?
well there are posters of him all over the octo expansion place.
Also since he made some of the weapons today (the aerospray, bamboozler an dynamo roller) he could be useful that way and the weapons are there