I saw them in 1973 as well. Tight band with Fagen on keys and Walter on bass. Besides Baxter there was also another guitarist named Denny Dias in those days. He was known for the electric sitar solo in Do it again and a great player. When live he performed that solo on a regular electric.
Denny Dias also played a very tasty solo on “Aja” - just before the Wayne Shorter/Steve Gadd dueling solos.