I think they should keep him at C as well. I don't think it's the right time to pair him with the other rookie without a top player. With Pospisil he had Kadri, to both handle the C spot and to balance out the skills. Honestly, I can't tell you what the lines were through the entire game, but it appeared that it was Huberdeau-Zary-Sharky. That allowed them to play Backlund against McD (and Draibaby?), and at least get sawed off results with Zary at C.
Kylington is day to day after the friendly fire hit at the blueline. Solo should draw in, but it's anyone's guess who gets rewarded with games. I doubt they play Kylington again if it's concussion related, but I think it was mostly upper body (shoulder/arm).