I think as mentioned in the earlier post, the recording information is the most valuable evidence and really not subject to opinion or conjecture. As one astute poster pointed out in the other thread, many of the songs show recording dates for "Marvin Gaye" and either "Demo" or "Background Vocals" or both, with Tammi not even mentioned. I think this is true for all the late singles in the "Complete" series which eventually ended up on the "Easy" album including "Good Lovin'" and "Satisfied Feeling."
I suppose at the time no one ever thought these recording session notes would ever be cited anywhere. LPs certainly never [[or at least rarely) ever included such information.
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