Yes, I played thos files again, and it's clear that the acetate was for the Mickay's record, not earlier recordings for Fred Brown's and Joe Hunter's Kable Records. Therefore, the girls in the background can't be The Primettes, unless it was recorded back in early 1961, and used with 1963 cuts by J.J. Barnes. I don't think that happened. Perhaps Motown's hitless Supremes moonlighted with Joe Hunter and Fred Brown in 1963, but, to me the girls on that record don't sound like them. I don't hear any of them individually. I have all the records you listed as having, plus one extra Mel Anton. There were 3 by him. Plus, I also have the first J.J. Barnes on Mickay's (#300) "These Chains of love"/"Color-Green". The other 2 Mel Antons you didn't list are: 3003 "What Can I Do"/"What's On Your Mind" , and 3005/3006 "Hey Little Girl"/"Third House, Second Block" (I've never seen this).
Did you know that J.J. Barnes' record on Ring 101 ("Poor Unfortunate Me"/"She Ain't Ready"), is essentialy a Mickay's production. It is only that Fred Brown ran out of money to press up the record, so he gave Armen Boladian half the publishing rights (Bridgeport Music shared with Brown's & Hunter's Brohun Music) to finance it. So, it came out on Ring (a label joint owned by the two partners.
As to the 3 rare records: I've never seen any of the 3. But Big George's Mickay's 3011 IS definitely Brown and Hunter's Detroit Mickay's 1962-64 label, and does exist. It is on "Soulfulkindamusic's discography of the label. The LB Tully and The Other Kind, I have never seen nor heard of, and get the feeling they are somewhat later than 1964, and they might not even be Brown's and hunter's Detroit label, or, they might be a later incarnation of the label, after it had been shut down in mid 1964.