Easily? LHD behind Rielly, Muzzin, Dermott, Rosen and possibly Hainsey. He gets another year in the A imho
Hainsey shouldn't be back, Rielly can play the right side with Muzzin and that pairing should get 23-25 minutes a game easily. Dermott is more than capable for a top 4 role next year replacing Gardiner.
Sandin can play RHD I believe as well. The Leafs need their best players on the big team and Sandin has top pairing potential IMO, look at Tampa with MG and Cernak. Those are cheap ELC's that they're getting amazing value from.
Like I said
Muzzin-Rielly (Has the potential to be one of the best top pairings in the NHL, think prime Seabrook, Keith days)
Dermott-Zaitsev
Rosen-Sandin
Muzzin and Rielly are the two on the pp
Muzzin, Zaitsev, Rielly, Rosen/Dermott can all pk.