There is only one way to find out.
The Sabres Front Office insisted on Krebs being part of the Eichel Return, put Him in position to succeed. He is already being used in a more defensive role. Asplund-Krebs-Zemgus had very good defensive metrics.
I would move Him to Center on the 3rd Line with Hinostronza and Olofsson or Okposo/Olofsson when KO is back.
Put Mitts on the 4 Line to minimize His Exposure 5v5, as Zemgus and Asplund could shelter Him. This would allow Mitts to continue to get Special Teams Time, the One Area He is good at