I have a completely different theory. It has been stated by Brandon Sanderson that there was an opposition to Adonalsium, some sort of "Other Force" that created a weapon that caused Adonalsium to split into 16 Shards. However, when we look at where two Shards fight directly, like in the case in which Vin, as Preservation, killed Ati, as Ruin, we see that both Shards "die." Perhaps it is the same with Adonalsium and this "Other Force." Perhaps the weapon that the opposition to Adonalsium created also split that "Other Force" into 16 "Other Shards," as I will call them. Now, let us look at the nature of Bleeder. She wants freedom from Sazed, or Harmony, and that may be another, different opposite to Preservation-Freedom. Instead of preserving things as they are, perhaps Trell, the "Other Shard" counterpart of Preservation wishes to free people and bring change. Also, the worshipers of Trell believe that the stars are holy and are the "Thousand Eyes of Trell," while the Mists, created by Preservation, block the stars from the ordinary eye. Also, Nalt, the main antagonist of Trelagism, may be a counterpart of Ruin, and the believers in Trelagism believe that the Sun is the "Single Eye of Nalt," blocking the stars from the view of the people. This can be linked to Ruin as another opposite, instead of bringing Ruin, Nalt blocks change and prefers things to stay as they are.