God can't see the future

If god could outline so many details of how the church should run in the D&C, then why didn't he also outline how prophets should be called? Did he not know JS was going to die? Did he not know there would be a succession crisis? (https://en.wikipedia.org/wiki/Succession_crisis_(Latter_Day_Saints)) The chruch split into like 6 different groups after JS died. If god doesn't cause confusion then he should have laid out a plan for the eventual death of the prophet. Since he didn't, it's easy for me to think JS wasn't talking to god and made everything up because he didn't need to plan for his death. 

You are all familiar with the story of Brigham Young looking like Joseph Smith after Joseph's death, which is why we believe Brigham was the next prophet and not Sidney Rigdon or Joseph Smith III. But if you look at the evidence no one there on the day wrote that BY looked like JS, in fact that story was started after the fact. 

This https://www.josephsmithpapers.org/paper-summary/history-1838-1856-volume-f-1-1-may-1844-8-august-1844/307 shows what the next speaker after BY said, they didn't say anything like "wow, did you guys see that, he looked just like Joseph" in fact what he said is "I agree, there shouldn't be a prophet, it should just be the 12 that run things" keep reading and the next speaker says basically the same thing, there shouldn't be a new prophet, just the 12 running things. On page 302 Brigham even says "either vote for Sidney or the 12, it wasn't between him and Sidney. And at the bottom of page 302 the vote is for the 12 to lead, not Brigham.

Here's a scholarly article where the author examines all the evidence they can find and discusses how this myth was created http://www.mormonismi.net/pdf/myth_creation.pdf Why didn't god just save us from all this confusion by telling Joseph how the prophet would be picked at the same him he told Joseph how all other offices would be filled? It feels made up because there was no clear outline for who the next prophet would be.