Quoting: Knuckl3s
Don't they already have a shutdown RD in T.J. Brodie?
Rielly - Brodie play quite a bit in fairly tough minutes
Muzzin - Holl play quite a bit, 90% of time vs top comp
3rd pair is fairly sheltered about 14 min per night
Both Holl and Muzzin struggled this year. Both could be injury related, so the next 10-15 games will show if they can continue to handle those tough minutes.
If not, then the Leafs can use either another Brodie type to play with Muzzin, or a Manson type to play with Rielly and then Brodie can pair up with Muzzin.
Either way, they don't need a Klingberg type that they have to worry about if he's out there vs Kucherov, Barkov, etc.