I think that the most interesting potential meaning of this idea is to unite the heralds. The heralds broke apart after the last desolation, and each has been following their own path since. The only way to defeat the desolation will be to unite not only the radiants, but the heralds. This is somewhat alluded to in Edgedancer, but in WOR as well.
The Heralds, like the knights radiant are broken people. They are all special in that they have unique gifts or abilities, but alone they are either destructive or misguided - Jezrian is jaded, Nale is narrow-minded, Talenel has been driven crazy (with the other heralds knowing that his penchant for self-sacrifice may single-handedly prevent the desolations, Ash goes around destroying art, and Ishar seems bent on using Nale to kill off surge binders in a misguided attempt to disrupt the desolation.
Normally, Ishar would be the person who keeps the Heralds pointed in the right direction, the recreance has changed things. By breaking their oaths, they have become lost. Since Honor is dead, he is unable to unite the Heralds, and Cultivation seems to be MIA. In addition, cultivation seems scholarly to the point that, like Wyndle, she may be more interesting in create a garden of fancy chairs than uniting the Heralds against the desolation.