>>714406268I'm not sure about the later batshit insane doujins Saigado did in 2010's, literal CP, like the KoF XI and several others from that time, but everything (literally every single last one of them) that was about "Yuri & Friends", "Athena & Friends" (sans yaoi and CP shit), Garou/Fatal Fury characters, and those crossover doujins (CvS), was official.
I think the reason why Saigado stopped doing SNK stuff, is exactly because SNK's dudes saw how far Saigado have gone, they saw that shota and loli CP and pederasty yaoi shit, and basically C&D'd them, slapped them on the wrist and severed ties with them. Saigado in later stages of their SNK content literally turned Kensou in a pedophile and a gay shota rapist, so that definitely didn't please SNK in the slightest. While they were doing completely trad (canon couple, straight gangbangs, lesbian, and futa on female) stuff, SNK was absolutely fine with it.
Saigado's doujins actually massively helped SNK's games sales, boosting them by at least 40% in the MVS and AES, PSOne, Dreamcast, and PS 2 eras.