Put Fiala and Kaprizov together and give them whatever center you want, just let them play together. Keep Ek and Greenway together and give them Parise or Foligno if you really want to keep those 3 together or Parise if you want a little more goal scoring in tight to complement the Ek/Greenway forecheck.
In either case, you have two lines you can them legitimately rely on offense with. Then you have basically the same level 4th line as now and a grinder 3rd line of something like Johannsson, Bonino, Foligno/Parise.
Instead of neutering your top 2 goal scorers and basically turning those line into grinder lines that require one man army level effort why not have two solid lines and basically still have 2 additional lines at the same level as now?
Makes zero sense.