The fact the Chechen mob are at Rostov isn’t a co-incidence. It is another example of Mr Wagner getting another ally on board. His support is swelling. If these two join forces the Russian army will start to shit itself, fold, or step aside. This is all going in one direction. It is now about perception of strength. I bet more allies will join.
There is another thing that will happen. Whereas Yeltsin’s attempted coup was from inside Moscw this must happen from the outside. Typically, if a city is well defended from the inside, a “policy of encirclement” is the most probably option. It is highly unlikely that Mr Wagner has picked off all of Putin’s Moscow inner circle, so my bet is that Mr Wagner has identified allies outside Moscow, and will encircle or pincer it
As they approach Moscow it should slow up and they will need to encircle Moscow, choke off energy and food supplies. I would imagine, if the Chechen crew support Wagner they may pincer their way into the City or sit outside the City and force Putin into a bargaining / negotiation (although I have a theory Putin may escape out to China if he thinks it is over).
The real surprise, is if Mr Wagner storms into Moscow directly with no resistance. That would be a shocker.