If you're interested in trying to get some insight into the "Wagner Incident", this article has the deepest insight I've come across:

A Matryoshka of Psyops – Pepe Escobar (The Intel Drop 6/30/2023)

I thought of it because it includes the "purge" element you mentioned:

Independent Russian media was already expecting some – treasonous – players, including state functionaries, to buy their one-way ticket when the going got tough (or to say they were “ill”, or refuse to answer important calls). The Duma – fed by Bortnikov’s FSB – is already working on a hefty list.

"Complex" doesn't even begin to describe the issue, and the author starts off by acknowledging that we'll only know with time what the hell it was really about in all aspects.

I would totally concur. If there are three things I've learned from the start of the SMO: Russians formulate plans and make preparations well in advance, they are very deliberate in all things, and they play their cards extremely close to the vest. Well, more like stuffed down into their underpants.

And if you compare any of this analysis to what gets flogged by the mainstream media, it's like a Venn diagram just showing two circles on a page.