moshe rabbeinu - Questions on Yitroh's Advise to Moses on appointing judges

Without further ado:

1. 
   

   Bney Noah are commanded on establishing a legal system and courts. I would expect Bney Israel in Egypt and through the Exodus to comply with this commandment. What Chidush did Yitroh advise Moses on establishing Batey Dinim for Israel, especially after they were commanded Dinim in Marah?

   
   


2. 
   
   

   Moses was a father of all prophets, spent a total of 80 days studying and mastering Tora and laws with Hashem on Mt. Sinai. Yitro was just a convert, with no Torah background. So what was the Moses' reason for judging alone and how dare Yitroh to offer Moses an advice?

   
   


3. 
   

   The Torah says it was Moses' first day of judging people. How did Yotroh get such a fast impression of an inevitable failure on the very first day, and how did Moses agreed so fast?

   
   


4. 
   

   When someone wants his advice to be heard and followed, he usually keeps the changes small, like if you want to advise your friend to change his $5000 car, you'd probably offer to buy a $10K or $20K but surely not $500K. Instead of offering to involve Aharon and his sons (5 men), or the Heads of the tribes (12 men) or the Elders (70 men), he offers to jump straight to a total of 77,000 judges. Is this way of thinking reasonable?

   
   


5. 
   

   The system offered by Yitroh totally contradicts the Oral Law we have ruled in Sanhedrin, i.g. courts of 3, 23 and 71. All appointed judges were single judges (דיין יחיד). How come?

   
   
   


6. 
   

   Moses prophesied the 77,000 judges. But did he also prophesied the division of the Israeli nation into tens and fifties and hundreds and thousands? If no, what's in the name of the judges, if yes, what was the division based on? (A bonus question - the tribes did not count full thousands and even hundreds - did some judges worked with more that one tribe?)

   
   


7. 
   

   Slightly off-topic and more general question: When does Moses decide to act on his own and when he decides to consult Hashem? Why did he not consult Hashem as he did on other occasions (like Bnot Zlofechad)? What was Hashem's reaction in this case - did He agree?

   
   

I am open to adding your questions also. Thank you.