They're guest writers responsible for specific parts of the game Scrap is Dylan's character btw not Hyao's
and i believe wisdom is the writer for Ste. Orgram is Zoroj's i believe as well and maybe a couple more. Edit to add in Hayden is also guest content! i checked the credits tab and it shows everyone who is a guest writer. Athos does Xer's stuff, ArionHooves does Arion and Dylan does Scrap. plus, Arthien is the one who does stuff for Hayden.