In a fight between Prygozhyn and Kadyrov bet on Putin. Both have their positions only because they are useful to Putin. Their public antics and feuding is theater. The moment Putin believes either one is a real threat to him they are gone and they know it.
“Bet on Putin”
I do believe Putin would absolutely kill anyone trying to usurp his power: Prygozhyn or Kadyrov.
However, I also believe in the mortality of Putin.