Alphonso Johnson during the fusion era was phenomenal. He had a seriously loose, but tight groove that worked in Weather Report just as well as Jaco, he just was not as outfront.
The Alphonso years are my favorite period in the history of Weather Report. Mysterious Traveler has to be one of my top ten all time albums. I was 18 when I picked that album up, besides Alphonso and Wayne Shorter's beautiful playing, WR were one of the first bands in jazz to use the studio as another instrument.

