There are some players who are true difference-makers on their respective team—whether it's the difference between being a lottery team and being a playoff team or the separation from a playoff team and a championship-caliber team.
These are the players that are indispensable to their teams. If they were lost for a prolonged period of time, it would be a critical loss to their team's postseason hopes.
Bear in mind these aren't the best players or even the most valuable. These are the most indispensable. These are the players whose production just cannot be replaced.
For example, while Dwyane Wade and LeBron James are easily two of the five best players on the planet, neither is on the list because the other is capable of carrying the team for a while if one gets hurt, as evidenced by LeBron James recent boost in production in Wade's absence.
It's not a slight to either to not be on here, it's a testament to both.
Also, I've taken history into account. Yes, Jeremy Lin has had a remarkable five-game run, but it's just that: a five game run. It's premature to call him one of the 10 most indispensable players in the game.