Lol. The Canes goal happened because Strome f***ing sucks, and Kane was way too late in recognizing the breakdown. A breakdown that happened because of Strome's suck. DeBrincat peeled off because he figured Strome would do what he was supposed to, stay with his man, and pick up the puck. He was transitioning to offense.
In hockey, if one guy loses his man, it creates an odd-man situation for the other four guys on the ice... And then you see things like this happen, because someone inevitably has to choose which guy to cover. The same thing happened here. One of the Hawk defenders got beat, so the Hawks had three guys covering two. If you have three guys covering two, guess what????? You now have two defenders trying to cover three players.... An open player is inevitable.....
As an offensive player, I will almost ALWAYS attack the weakest defender on the ice. Because when I beat him, help will come over, and we now have an odd man situation elsewhere in the zone... If I'm doing this in beer league, you can bet your ass guys are doing this at the NHL level.
As the young players improve defensively, they will get beat less 1 on 1, and you will see less odd-man situations developing in the defensive zone as a result. This isn't rocket science, and I'm so tired of seeing people overanalyze it, and blame "systems". Bad defensive players will suck at defending in ANY man-to-man system.