Overall, it definitely could have been written better. Much of it is very dry, but I can't get on board with attributing the discrepancy to proofreading because that was the very purpose of the question. The question was, what is the number. They answer is two.
Another reason proofreading doesn't solve the problem is because after publication in 1835, they had 9 years of reading it before 1844. If there were any mistakes that bad, they would have corrected them, especially if Joseph was teaching what is claimed.
I read Orson's talk, it's good, but I think he was just trying to figure this out just like we are. I quoted some relatable lines.
"But I will not say that the Holy Ghost is a personage, the same as the Father and Son."
"and the Lord has never given me any revelation upon the subject, and consequently I cannot fully make up my mind one way or the other."
"Everyone knows that it is absurd to believe in a personage being present in two places at once."
Regarding the last one, I agree all forms of matter can only be at one place at one time, but not intelligence.
We are still left guessing what the mind of God is right? How about this; it is the collective consciousness of the Gods who have gone before us in all previous iterations of the plan of salvation. All those who have done as Jesus has done. We never do incorporate them into our understanding, but maybe this mind of God is the collective mind of all Gods.