How Does Allah Decide Who Will Be His Messenger ?
Actually your answer is a cop-out. Allah knows who has the best morals and he selected such a person to be the messenger.. the only issue is Allah didn’t inform us.. that person informed us .. now.. that raises concern.. that person can lie that he is chosen messenger ..
Prophet’s character as ‘Sadiq & Ameen’ is not based on these narrations which in terms of ilm-e-Hadith are known as Akhbar-i-ahad, rather it is based on established history. We need to differentiate between these two. The problem arises when people conflate these two and consider them as equivalent to each other. The best available source is established history which is transmitted through the same means as are Quran and Sunnah. These narrations are inherently limited to be judged by yardstick of Quran and Sunnah. This is all in accordance with the Principles laid down by Ghamidi Sahab, we don’t accept or reject something solely because we don’t like the content, rather it’s all done across the board in accordance with the principles laid down. For our detailed point of view on the said matter, please refer to the following two videos . Please refer from 41:28 till the end https://www.youtube.com/watch?v=cHvgN0z9L_I&t=2806s