Well, I was thinking of artists like
this one, right now it may seem like he actually worked in all these albums, and is considered "featured on" doujins only. So it's ok to mark him in albums like Dissidia as "featured on"? I'm getting a bit confused now...
Also, what about having these "featured on" artist links with a darker/lighter blue? It'd be easier to know at a glance instead of checking every link.