Maybe that first song Stevie offered Chaka was “Lovin’ You”, eventually a niche hit by Minnie Riperton.
I recall even back then, people were impressed with Minnie’s voice, but confused to slightly amused by the song’s refrain.
In my opinion, Stevie’s commerically potent songwriting skills gently nosedived from that point on. Everybody has their day in the sun, or as close as they will ever get to one. Then creatively, they begin to either fade or repeat.