First premise, I don't necessarily believe it was this goal that lost the game last night. And I'd probably place more onus on the direct action that put the fluke goal into the net. Forwards failing to cover the dmen was also a huge issue last night.
Regarding Buckner, I think was fundamentally a strategic error by Red Sox McNamara who chose not to replace an injured Buckner with a late innings replacement. This was their regular strategy and one that was entirely controllable in that it could have been made to start the inning or at any point within while the Mets were at-bat. The pitcher Schiraldi did his job inducing a slow infield roller to the first baseman. Buckner's misfortune was preventable but the manager - a great guy by all accounts - deviated from the strategy to mitigate a hurt, so so fielding first baseman.
Hockey by nature is more chaotic with many variables that can contribute to a breakdown or goal. It is also a game that is so different to watch from different vantage points. From our couches and with benefit of replay we can easily see a play develop and breakdown what is happening aided by commentators. Live viewings from the upper seats are great for watching the play develop and we can easily follow the play. Watching rinkside is entirely different and is a far more reactive experience. We see how fast these players are, how heavy the hitting is, and how hard shots are, but the speed is so fast and vantage point so close, it is really challenging to see the play develop that comes with some distance removed from the action. Sheahan's reaction time to pick up and react to Bear's situation of trying to clear the zone is happening in seconds or possibly nano-seconds. He did what he was trained to do - present himself as an outlet option, have his head up and looking forward and across to gage what to do with an outlet pass. The puck at speed rings around the boards (never a 100% precision activity) that unfortunately farts out into the Oil zone and turns over. Followed by additional breakdowns, good fortune for Chitown and in the Oil net.
I don't accept the argument that this one micro-event lost the game with the volume of mistakes made, penalties taken, and frankly luck that landed last night for Team Hawks.