John, I'm guessing that Gamble & Huff used The Three Degrees on MFSB's "TSOP" [[instead of The Sweethearts Of Sigma) because they were grooming The Three Degrees for bigger and better things to come. Their plan to turn the girls into international stars worked like a charm in other countries including the UK, but, for whatever reason, not here in the U.S. [[Surprise! Surprise!) They were off to a promising start when their "When Will I See You Again" 45 went to #2 on the U.S. pop chart and #1 in the U.K., but their first self-titled Philly Intl. LP which contained the hit single only made it to #28 in the U.S., and their 2nd P.I. album, "International", stalled at #99. Not exactly an American success story. But, I'm guessing that was the reason why G&H chose the Three Degrees for the Soul Train Theme over The Sweethearts.
If you'll recall, Gamble & Huff, did, however, use The Sweethearts Of Sigma to promote Kodak's new camera at the time called "The Zip" which was included on MFSB's "Philadelphia Freedom" LP.
https://youtu.be/ceCgGJyvtNA
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