>>/50543/
 >>/50547/
> Or did they expect a successful offensive
I don't think so. They know Russian fortified positions better, and generally the situation what's it like there and what can be expected.
The good thing about the Ukrainian offensive, and what they made use of is that combat ready Russian units are tied down in Ukraine and busy to keep the situation as is, even those in reserve can't really make a move, since they might be needed on the front any time. Those men who are willing to fight are there.

> How many allies outside of Wagner did Prigozhin coordinate with before the uprising
Still supposing this was a coup attempt it was not for the sake of a brain game (I don't want to call it gymnastics for it's implication) the simple answer is: we don't know, no information about that. I think he contacted Putin, they probably have their own landline used between each other when they do their deals, no need for official channels. But if you mean other units? They sure planned their route, and contacted those they are going - or at least Prigo and couple other guys rolled forward in a car before the column arrived and told. I don't think there was any surprises.
It is no use to contact generals of units holding the front, they are bogged down, or those that weren't in the way.
Then Prigo went public asking everyone to join generally.
> how much support/passive indifference did he accrue during his march on Moscow?
I dunno if we'll ever get any info about this. He  >>/50533/ mentions the 217th guards airbourne regiment, and I also saw the VDV getting mentioned here: https://yewtu.be/watch?v=rylvYmIyLBE at about 10:00. So that's one unit.

> They got halfway from Rostov to the capital in a day, that's a lot of ground
I think they split into two, one group to Rostov, one towards Moscow (via Voronezh). They started on the eve of June 23rd, perhaps midnight the latest.
> the only resistance faced was a few aerial attacks
I dunno if there were real aerial attacks. I saw one video a helicopter shooting fireworks, but no actual explosions or anything. So maybe those were just distractions than actual fights. It was said somewhere Wagner lost no man.