Honestly? It’s not an individual sport.
Let’s say you have two blank slate teams of no-name players and everyone on the roster is the equivalent player of Calle Jankrok. The team that adds Quinn, Jack and Luke is going to beat the team that adds Wayne and two guys that are below replacement level. I have virtually no doubt.
That doesn’t mean the Hughes bros are “worth” more or … actually mean anything at all. But for the sake of this academic question, I am taking the trio of all stars because it is a team sport.
Two things.
1. Your scenario is unrealistic. There are no "two teams of no-name players and everyone is an equivalent player". Doesn't exist. How about a real world example instead? Consider any team you want. Vegas, Edmonton or some other top team? SJ or Chicago or some other bottom team? Some random team in between, or your own favorite team? Either way you slice it - you put Gretzky on such a team and it likely puts that team over the top as cup contender, and for many, many years.
Imaine Gretzky with Bedard & go in Chicago? Or with Celebrini and all that other talent in SJ? Or with Vegas's insane core, or with McDrai? Or - I believe you might be a Rangers fan - imagine adding him to Rangers, do you not think it fixes their issues and makes them #1 favorites in the East?
I definitely wouldn't pass up Gretzky, despite thinking the Hughes brothers are really good, obviouisly.
2. Even if we take your example literally, of random no names - I *still* prefer Gretzky in that scenario. In fact, I prefer Gretzky in that scenario a lot more then the first scenario.
Put the 3 Hughes brothers on that random no name team and....sorry, it's still a team that isn't good enough to contend. They'd become one of those teams with a few good players, but crappy team overall who spends years in bottom of standings.
Put Gretzky on that team? Two things happen. One - Gretzky more than any player in history has an ability to make his teammates better. I guarantee he turns a couple of those no-name NHL'ers into 50 goals/100 point players. And he helps improve their work ethic, and compete level, etc. Second thing is a bottom feeder team - even one with 3 Hughes brothers - usually will have a ton of troulbe attracting UFA's. But a team with a rookie Gretzky will have no problem attracting UFA's, who will want to play with him. Gives a bit of an advantage to building a team.
Big UFA names that are/were due in recent years include - Rantanen, MacKinnon, Draisaitl, Matthews, McDavid just to name a few....I think a couple of them may consider holding out to join Gretzky.
Bottom line - you don't pass up Gretzky, ever, unless the other option includes someone like Orr or Lemieux.