I find it strange that people thought Schenn was a good d-man when he played for TO. I think good d-men need to have more attributes than Schenn, his physicality was great but the puck lived in TO's end while both him and Rielly were paired together. Two things that a good d-man needs to be able to do are skate and either pass the puck or simply move it. A good d-man interrupts the movement of the puck from the neutral zone as the opposition tries to bring it into that d-man's zone, gap control, this requires speed and IQ, this isn't something Schenn could do without speed so like Polak he simply tried to defend when the puck entered TO's end, Rielly has the speed but I've always thought his IQ was missing defensively. Schenn's lack of speed also meant that he couldn't press in the opposition's end, breakaways would surely ensue but his inability to press was further hampered by his inability to pass or move the puck. Good or even decent d-men have to be participating in all facets of the game, 1 dimensional d-men such as Schenn are not assets.
I couldn't believe that Schenn was paired with Rielly, that really was an eye opener to how poorly TO was as far as defensive depth. The same should be said of forwards, Kampf is horrible, watching him PK with Marner really points this out, Marner defends by harassing the opposition all over the ice, Kampf basically retreats and tries to defend, good goaltending is his greatest ally.
I find it hard to understand that PPs are manned by TO's best players because they are considered special teams requiring special, another name for exceptional, players but PKing which is also considered a special team job is manned by 3rd and 4th liners when really these should also be manned by TO's best players.
We see how well Marner PKs, I'll bet that Matthews and Nylander would also be as effective but we'll never know because Babs and Keefe didn't/won't properly experiment.