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Historylegends
https://yewtu.be/watch?v=7PyQnjeJXtM
states here that Wagner was about 8000 at Soledar.
Then towards the end of the video he says "the Wagner core was not entirely disbanded". Perhaps he is right, and the originals (what's left of 'em) are kept, and they'll be moved to that camp.
There are other stuff too.