Not yet.
But Champions are made. Not born.
Matt Stafford wasn't a champion. Didn't win in the playoffs. Until he did.
Peyton Manning...quite possibly the most complete quarterback of all time choked in the playoffs. Until he didn't.
I believe kyler Murray is a competitor and if he has any self awareness or strength of character at all he is embarrassed by his performance in the playoffs.
For any competitor the greatest challenge they face is the man in the mirror. They either lose to him, defeat him, or make peace with him.
For Kyler, imo he needs to accept that while the people in his camp have done a great job in getting him to this point,... in order to advance as a player he has to thank them and move on.