It's a big leap to assume Mikheyev will be ready for top-6 minutes immediately upon returning from a major injury. He's missed 2/3's of the season, I don't see him slotting up that high right away. Start him on the fourth and see what happens, but they need a contingency plan in case he can't handle it.

I see D pairings being more like:
Muzz-Holl
Rielly-Barrie
Derms-Ceci

But again 3 of those guys have been hurt for a while so who knows what they will come up with. Might see Sandin in instead of Ceci.

Don't think for one second that Ceci will not be playing if he is healthy. (Not my choice but, it will be the coaches choice). On that note, Travis Dermott is nowhere near a top pairing defensman. Especially on his wrong hand.

Still need a goalie for playoffs and d core

Freddy will find his game by the playoffs. When he's on, he's a top 5 goalie in the NHL. Also, D core has looked really good over past little while even with injuries to top guys. I'm sure once Muzz and Mo and back in form, Leafs D core is going to be a lot better than people think it is.