"Reconstructing the History of Motown Session Musicians: The Carol Kaye/James Jamerson Controversy"
For what it's worth, this is an article from the Journal of the Society for American Music, published online by Cambridge University Press. The Journal is "an international, peer-reviewed journal...dedicated to supporting scholarship..." In it, Brian F. Wright, a professor of Music History at the U. of North Texas, presents a scholarly review of the data, exploring new sources, including musicians' union contracts from Motown's LA division, Kaye's recording logs, and a personal interview with Allan Slutsky.
No matter to whichever side of the controversy you fall, I think you will find this a fascinating read.
https://www.cambridge.org/core/journals/journal-of-the-society-for-american-music/article/reconstructing-the-history-of-motown-session-musicians-the-carol-kayejames-jamerson-controversy/57ACC9F2F2411AF36EB905769E1E53C3