Agree with Bao. This is a possibility. Mr T. asked for (and ostensibly received) the "capacity" to save the world. Perhaps what Roshar needs to survive is not a hero but a villain (odium's champion?) to rally against.
So perhaps Super genius Mr T., in his infinite wisdom, concluded that it would be better for everyone if Odium won. Then is writing the diagram for the perfect plan to help Odium win, writing it in a way to purposefully mislead his dumb self, and followers, into thinking they are trying to save the world.
Instead they will follow the diagram & become the villain that the world incidentally needs (capacity) to wake up and gang up on.
It kinda fits with the whole: too dumb=useless / too brilliant=dangerous theme of Mr T.'s interlude. And it would mean that the motive behind this code, behind destroying the KR, is not to stop the desolations but make them succeed (therefore going against the "KR are hastening desolations, that is the secret that brought the recreance" theory).
I say that, but I do like the "need to abolish KR to stop/slow desolations, this realization brought the recreance" scenario. I can totally see the Oath pact, heralds & unmade thing being a deal between the shards to do an honorable fight for survival and the rule of Roshar every X years, purposefully sacrificing thousands of lives every desolation.
The cycle of life and death is in line with cultivation. Honor would be ok with an honorable agreement if it binds Odium. Odium would be bound but with a chance to win it all if it succeeds at least once, and the regular bloodbaths of the desolations caused by the pact would certainly please him.
The easy way is to think Honor (good) vs Odium (evil), but the books illustrate both good side and bad side of honor, as seen as Sezth actions or the sky breakers's philosophy vs the wind runners'. Perhaps Odium used Honor's attributes to lead him to agree to a distasteful pact.
The heralds could not deal with the intentionally eternal cycle of horrors and broke. KR found out the truth and broke. All of this oath breaking killing Honor.
Or Perhaps the bondsmiths plan was to kill Honor, to stop the desolation cycle, by breaking the KR vows and killing the sprens. A great betrayal indeed for sprens that are splinters of honor.
It would be a typical Brandon reversal of what you think is good (the heralds purpose and oath pact) turns out to be the opposite by the end. It also kinda fits with WoB comments about exploring right vs good in the stormlight archives.
