Bonham seemed to be trying to evolve his style on the last few albums. I’ve always thought he was about ready to make a big jump style wise, but we’ll never know.
It’s interesting to note that the rest of the band (Page in particular) actually exercised veto power over Bonham’s playing style and equipment. Bonham wanted to used double basses, and Page nixed it. If Bonham got too busy or creative on a song, Page would dial him back.
In an era when big drum sets were the norm, Bonham played a very basic kit—single bass, snare, 1 rack tom, 2 floor toms. It’s my understanding that the rest of the band pushed Bonham to stay with a basic kit.
Yeah, I could have seen him doing what Neil Peart and Phil Collins did, trying out some Jazz and Big Band stuff.