Tavares had the hit with She’s Gone.
Hall & Oates to the song to #4 (Pop) & #93(R&B) while Tavares went to #1 (R&B) and #50 on the pop charts
It’s always been hard to judge artist’s successes because each label will do things differently. Many artists have had brief “second careers” Aretha Franklin, had a big pop album in the 80s. After her song “Jump To It,” failed to make much of an impression in the pop charts, they thought she was dead. She came back with “Who’s Zoomin’ Who?” (Album).
Lots of other examples including Neil Sedaka, who had two spans of success.
When a label drops an act what it does is wake the artist up and then they can take control over their own careers again. For instance, in the 80s Juice Newton (a solid country artist) had more success on the pop charts. When Capital dropped her, RCA picked her back up and she came out with “Old Flame,” her biggest album which was solid country and promoted as such.
Captain & Tenille were dropped by their label (I believe A&M) after declining sales only to come back with the #1 song, “Do That To Me One More Time.”
No one thought Jackson could beat “Off The Wall,” but he did. No one thought any album would surpass “Saturday Night Fever,” but “Thriller,” did. No one thought any album would ever outsell “Thriller,” But the Eagle’s “Greatest Hits,” passed it.
In the 90s as the rock era came to a close and the R&B era took over mainstream pop, (Indeed by 2004 all the #1 songs were R&B, thus the death of the rock era), it became harder, because you can’t compare one song to another.
The real measure of a song is its sales, not the number of weeks it is at number 1 or gold status etc, 'cause they way they compute that has changed. For example “Physical” or “Bette Davis Eyes,” went to #1 for 10 weeks and 9 weeks respectively. But if you were to use the same methodology they use today, both songs would easily pass 30 weeks at #1.
I remember Lotus 1-2-3 and how I LOVED it. Now who uses it? (OK a few). Remember Altavista, the “Google,” of its day?