OV is always open because he's the best goal scorer in the league.
Every team always has a game plan to try and neutralize him but it doesn't work because he's simply that good.
Trying to reinvent a game plan just isn't going to work against a generational talent IMO.
I always find it funny how the home crowd think their team should be the Harlem globetrotters and the opposing team is the Washington Generals [perma-losers]. I'm not saying I wouldn't want that, but the crowd sort of expects it. As if the opposing team is just canon fodder for them and doesn't have their own fan base wishings ills on MSG.
For example, when the King was on top of his game, I can recall several shooters stare into the heavens asking "whhyyyy..." when Henrik stoned them on a 99/100 shot.
So the same think goes for a sniper. They make their money well...sniping the corners, so sometimes Brett Hull is just going to roast you. Although technically an error, there is little way to fix it given the skill gap.
So far in the case of Ovie, teams can't neutralize his rail gun shot, yet they luck out when at some point the other 22 players doing all the work to get him the puck get I cured and tired, and he just doesn't give a shit anymore. For example, see the second round of the playoffs for over the last decade.