kEiThZ
Superstar
Not sure how believable this is:
On one hand, it's not exactly hard to imagine that Putin will do this; on the other, it is hard to imagine Prigozhin didn't anticipate it.
AoD
There's a running theory that Prighozin thought of this as a way that threaten and extract concessions. Didn't anticipate how the whole thing would turn out and be seen.