Under what circumstances will you resolve this market?

@marvingardens confirmed by hikaru, the player, or some reputable organization like STL chess club

@_M_ Confirmed that one of these players is helping Hikaru prep, and also that zero of the other players are helping him prep? It's likely to not be outright stated like that. If Hikaru makes a statement that he prepped with e.g. Sam Sevian, that doesn't mean that e.g. Lenier Dominguez wasn't also on his prep team.