Ian could have doubled, is he credit with keys only?
I'm really curious now: Ian Underwood is nowhere on either Waka/Jawaka or The Grand Wazoo so how could he even be playing electric piano when that assignment was left to George Duke? This is the first I've ever heard of Ian on any part of the two.
1. No, you can't play woodwind and keyboard at the same time, not in the manner of a complex interplay going on there. Ian played synth and el. piano exclusively. The other horn players took care of woodwinds. Ian was back on woodwinds by the Ponty era tour.
2. I'm not sure why Ian was not on Wazoo albums, but appeared as part of the GW orchestra. He's on "Joe's Domage" though. It's likely that the guy was somehow too busy to sit in for the 1972 studio sessions. Of course I was referring to the live arrangement of "Big Swifty", which as FZ said, was spiffed over a bit compared to the studio record featuring multiple guitar and trumpet overdubs, and yes, Duke on el. piano.