Looking at the team's schedule/results. With either Raanta or Andersen in net, the Canes have not lost a game in regulation since Nov 12th, a 4-1 loss to Colorado.
Since then, all 4 of the regulation losses have been with Kochetkov in net. Not saying all those losses are his fault, particularly the AZ loss where the team didn't show up, but the other 3 he didn't play well in after he returned from his injury in January.
11/23: 4-0 AZ
1/3: 5-3 NYR
1/5: 5-3 NSH
1/10: 5-3 NJD
Raanta had a few stinkers that we still got wins/points in, the SO win over NJ comes to mind.
But think about it, with either of the teams 2 NHL goalies in net, the team has not lost in regulation in 2.5 months.