Doubt it. I think this guy wants control of Russia.
I strongly advise you not to give Prighozin the benefit of the doubt- he's a HUGE Nazi, and has the tattoos to prove it (plus he literally named Wagner after... well, Wagner. Hitler's favourite musician).
Best case here is mutual destruction of russian leadership.
Sure. How much do the alternatives cost?
It's all well and good to cry for getting rid of XYZ, but if there's no good alternative (or in this case, cheap), it's just not going to happen.