Luna Wolves = Sons Of Horus = Black Legion
So YES! All four of the chosen could be origional Luna Wolves as old as Abaddon himself (or older even, iirc Abaddon was a second-generation of recruits from their homeworld whoes name currently escapes me). Or they could have been recruited during the Legions time as Sons Of Horus.
An important point as well is that the Black Legion welcome all CSM, no matter their background, which is why Abaddon has quite so many battling under his personal banner, far more than any other original Legion. So not only can they be from pre-heresy LW/SoH/BL they can also be from literally any source, be they originally loyalist or from another traitor legion. Abaddon is the one being able to truly unify the various legions to any single joint cause.
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its not like they are taking in new members
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Yes they do. All chaos forces recruit from feral and chaos-held worlds, that's how they keep up their numbers. they also take in renegades from loyalist chapters and indeed entire companys of loyalists who have be taken under the powers of chaos.