I watched a making of Adore behind the scenes video and James Iha definitely played on the album. He's great when it comes to atmospheric sounds on guitar. He may not have written lyrics or anything, but his playing is definitely on the album. There was lots of footage of Billy, James, and D'arcy in the studio playing. Billy is more about riffs and melodies, James is more about complimenting those sounds with layers and atmosphere. Him, Chamberlin, and Corgan are important to have together for the Pumpkins sound. Hell a lot of Iha's solo album sounded more Pumpkins than Billy's later stuff.