I think his plan was initially to go to Moscow and then as the day went on, realized that it was going to be a bloodbath for both sides and not get anything he wanted. He seems to be sort of a hot head and just went off til he had time to really think it thru.
So yeah I think he came around to a point of "What the Fork! am I doing ..what we gonna do if we capture Moscow" and that scared him. He doesn't want to be President...he wants to continue PMC Wagner, make billions and live his life.
I think the plan was put together with others and he just abandoned them. Do Belarus offers safe haven ...quasi exile. But he is a targeted man by some who may not like his 180 turn.
Now word is there is no guarantee Shoigu gets canned.
Was there some leverage Putin had over him? Family?
I wouldn't drink any tea. Ever.
As for Putin he is gonna have to do something soon as a "show of strength" I think. What that is I don't know.