Enix is a publishing house as well as a developer; most of the games you listed weren't touched by them except as a publisher. It'd be a bit like crediting Activision for Blizzard's stuff, or THQ for Relic's stuff.
Soul Blader/IoG/Terranigma were by Quintet.
Star Ocean/Valkyrie Profile were by Tri-Ace.
E.V.O./Wonder Project J were by Almanic.
Enix does get props for Dragon Warrior, though, which is the single biggest JRPG franchise in Japan, and which basically created the entire genre. Even there, though, they didn't develop the first games in the series (which were by Chunsoft).