These are all good comments. The other side of this is less spectacular in that Prigozhin has always been at odds with the MoD and the high ranking generals, especially after they allegedly (?) did not resupply him with ammo and fuel that he needed. According to some, he also did not want this stalemate to go on forever, and thought the generals were too cautious. This was his way of showing Putin, his friend BTW, of how serious he takes this.
As far as the CIA getting played, it's possible, but better than the alternative of the CIA fomenting a rebellion. Putin and Prigozhin may be friends, but the FSB has operatives on his staff - count on it. If; a big if; there was a CIA operation to instigate this, the actors, both US operatives and the Russian "allies" are in a world of hurt if they are caught. The CIA guys violated a golden rule if they did this: messing with a third world country as a proxy is one thing; try it against Russia itself and you might end up shipped home in pieces. Even for our current crop of leaders, I would find this decision over the top. JMO