Quoting: Caniac2000
Rielly is the most overrated defenseman in the NHL from the aspect that he doesn't play defense. In the past 3 years, no D man has been on the ice for more goals against than Morgan Rielly. Pesce is amongst the lowest of D men that have played more than 3000 minutes over the past 3 years. Rielly has not even been doing the scoring this year to prove his value. Pesce has the 2nd best xGA among D men in the league this year. Stats back up what I say, stats don't lie.
Its a system thing and also here are the partners that Pesce has got to play with.
Slavin, Gardiner, De Haan. All good to elite players. Rielly? Matt Hunwick, Nikita Zaitsev, Ron Hainsey, Cody Ceci and for a little while Barrie. Guess how many of those guys are good? Just Barrie. Also TO as a team hasn't been very good at defending, 1 player doesn't change that, this isn't basketball, you need a full team commitment to defending. You guys that like to talk all sorts of trash but have zero idea how the game works are so annoying. As the game gets faster and more skilled, the only way to defend successfully as a full 5 man unit. Something Carolina has often done well, but something a young Toronto team still needs to get better at. Although their goals against under Keefe has been better than it was under Babs but again, that hurts the rhetoric that TO can't defend so lets just ignore that.
Learn to play hockey and then watch player rotations in the offensive zone, then watch to see how when TO gets scored on, its generally one of two issues.
Either, the forwards don't rotate to the slot fast enough leaving someone wide open, or the Leafs turn the puck over in the offensive zone and give up an odd man rush.
That isn't 1 defencemans fault like goofs like you seem to think, its a systematic breakdown that needs to be corrected. You'll learn eventually.
Keep Pesce and all your other super elite defenceman that are worth more than the rest of the league combined.