I'd keep Kuemper given Raanta is apparently more fragile than a grandmother.
Kuemper has managed to be better than the average in Sv% and GAA playing a load he was completely unexpected to.
If Raanta has issues again next year Kuemper seems to be able to handle it. We've dropped a bit in the rankings but the team is still a very respectable 11th best in goals against.
As usual our problem is up front . If Kuemper has to be our starter he'll be good enough based on what we have seen.