By 1974, I think creatively, Cooper was done. The best work was prior, including Billion Dollar Babies album, KIller and prior work.
Wow, surprising statement to these ears. From the Inside, Da Da, Welcome to my Nightmare, Whiskey and Lace, Goes to Hell... all post '74, and all very creative albums. Heck, even Flush the Fashion was very creative, even though I personally didn't care for it (disco-lite).