Well I assume that means he came up with the keyboard stuff by himself. Obviously in collaboration with the band since he also produced and recorded all the albums. There's some other dude called Charlie Storm who had synth & programming credits as well so I don't know who did exactly what, I would assume he helped adding some cool keyboard shit on the album, and not being ''hired'' as a session keyboardist or anything. My point regardless was just that I don't care if they get help or collaborate with whoever doesn't matter to me as long as it sounds awesome. I mean keep in mind, most of their best solos (IMO) during Nordström era was mostly guest-solos by other guitarist friends.