Yup, he was a true A-lister, but so were all the others on the recording linked by Beowulf9.
How fun it must have been to be that talented, be solidly in the middle of the music business, in California in the '70s and '80s. Hard to imagine anything sweeter. A very, very selective club.
Probably the weirdest Lukather appearance was in Cheech and Chong’s Next Movie.
https://www.youtube.com/watch?v=Q6PpCA7BV7E
So talented. Ca at that time was still good.