The directionality and distance of the clues, as well as the tier of the target... all of these could affect the cost of divination.
Leonard Churchill had guessed that if his plan succeeded, someone might track him down using this anonymous tip.
On a logical level, there would be no flaws in this anonymous letter, Churchill was confident of it.
Therefore, they could only trace it through mystical means.
'Since I'm going to be divined anyway, might as well make it a bit difficult for them,' he thought.
If one does not leave their name, the pursuer would have to divine the origin of the entire letter.
But if one were to leave their name, that would be a directional clue.
'Sunny Commoner' instantly strikes one as the name of a place, and most likely the diviner would first try to divine in this direction.
After all, with directional clues, the cost of divination is much smaller.
