I don't like Kadri at centre because he can't win faceoffs. Grabovski can though, so why not put him at centre?
1st unit
Kessel - Grabovski - Kadri
Phaneuf - Kostka
2nd unit
van Riemsdyk - Bozak - Frattin
Liles - Franson
My reasoning for the 2nd unit is that having van Riemsdyk out there with Phaneuf is pointless because Phaneuf never hits the net, whereas Franson gets his shots on goal, making the screen more valuable. Bozak, aside from winning faceoffs, has good hand eye and can bat rebounds from point shots from the slot (like he did vs Montreal). Frattin is a net crasher and JVR is hard to move. This unit will generate everything from the blue line.
The 1st unit will try to score from the sides or the slot, and with two left handed shots they can get better one timers from Kessel passing on the left side.
Kostka is only there because the Leafs don't have anyone else until Gardiner gets back.