Forgot to give the ultimate link for Pre EB Musicman
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MM was sold to EB in 1984
In reality, these later year basses were assembled by Grover Jackson due to a variety of issues as noted here (really good history the pre EB IMO:
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Short version; Leo owned a company called CLF research that made the parts; Leo and others owned MM that QC'd the parts and assembled the instruments; there were problems between the companies; MM was nearly bankrupt and Jackson assembled some basses; EB bout them in March of 1984 and continued making the Stingray
Not 100% sure about this detail, but EB continued down this road for many years and introduced their first original design bass (Bongo) in 2004
You could be entriely correct about 2-band vs. 3.
I base my statement purely on reading threads on these instruments here and on the MM forum; and maybe just the diehard 2-band guys post the most?
OTOH, there was enough interest for them to start building the classic series which aren't very different than the standard Rays (no offset body and addition of string mutes); pretty sure you could have always ordered a single pup 2-band Ray although stores around me seem to stock the 3-band.
I think both are great, but given the choice I prefer the 2-band.
I've read all of the MM stuff before. I was responding to your comment that an 83 model was Leo era -- it's not. It may be pre-EB, but it is not a Leo era bass; he had been at G&L for a couple of years by 83.
With regard to the classic Rays, I don't think the initial reason to build them had anything to do with the two band preamp. Remember that that exact same two band preamp that is in the Classics has been available as an option on Stingrays all along. I think the idea for the Classics has more to do with the overall fashionability of retro instruments at the moment, and the Classic, being a reissue of sorts, takes advantage of that fashionability. Also, the Classic does offer some features that are not currently available on other Rays, like string through mute bridge, slab body, vintage radiused fingerboard, high gloss neck, silk screened vintage style logo, metal battery cover, and vintage style colors.
Again, the two band preamp is available on any garden variety four string single pickup Ray even today (at a reduced price from the three band model no less!)-- you don't have to buy a Classic to get it --and I don't remember many people going on about the two band preamp until recently.