Mary Wells left in the summer of '64! Supremes were hitting with
Where Did Our Love Go as Motown was battling in court to keep
Wells.
I do believe the Supremes would have been big even if Mary
had stayed. The company had tried to get them a hit on their
previous releases.
Mary Wells first post-Motown release was in Oct. '64, "Ain't It The
Truth" b/w "Stop Takin' Me For Granted".