The above numbers (Wins Above Replacement) are production compared to a “replacement” player, or the type of player that’s always available on waivers or on someone’s AAA roster. Good teams are able to fill out their roster without having much replacement-level production at any one position. As you’d expect with a 100-win team, the Indians have been able to accomplish this.
But the Indians have not only been able to avoid bad production, they’ve had outstanding production compared to their peers. Wins Above Average is the measure of player production compared to the average player (adjusted by position).