Honestly, if Kopi is getting too slow for 1C (he already cannot keep up with Fiala and Kempe and it is one of the chemistry issues) and Byfield is not ready to take 1C, it wouldn'be a bad idea to put Kempe back there.
Yes he may be better at wing, but Kempe finally had his breakout year, last year...he was not great at C or W , just 2 years ago. He was fine at center at the age of 21, when he had Toffoli and Pearosn, when Carter had his achilles injury. Kempe is so much better now and could do it. He was 21 and had some top offensive numbers in the league, the first 2 months he was at center. Is he a better winger? Perhaps, but by next year (or even now) he would be a better #1C than a 36 year old Kopitar would. The Kings need speed down the middle. Kopi is the slowest #1 center of all 32 teams and that's a problem.
I also think Vilardi could do it, considering he was #2 center, 2 yrs ago and was slower, not at full strength, not great defensively. He's much better now, in all areas of the game. He had an uninspired Carter and AA on his line. He could excel at C now, with Fiala and Kempe on his wings. Easily. By next season, I would rather have Kempe or Vilardi there.
One thing that is criminal atm: one of your top 2 offensive forwards; Vilardi on line 3 with Lizotte and Arty.
It's just wrong. He needs more minutes and top 6 duty.
Fiala Kempe Vilardi
Iafallo Kopitar Arty
Moore Danault Arvidsson
Grundstrom Lizotte Fagemo
Lemieux