Was there any kind of logic used by Motown when group members departed and that member stayed or later resigned with the company?

Supremes/DRATS/Diana Ross - Supremes/DRATS were on Motown and Diana Ross was on Motown

Commodores/Lionel Richie - Commodores were on Motown and Lionel Richie was on Motown

Miracles/SRATM - Miracles/SRATM were on Tamla and Smokey Robinson was on Tamla

Temptations - Tempations were on Gordy and David Ruffin was on Motown, Dennis Edwards was on Gordy, Eddie Kendrics was on Tamla.

Just curious.