Christians, why did Joseph's brother have to bring Joseph's coat back with blood on it to their father? And...?

How does the story compare to the Suffering Servant Messiah, Moshiac benYoseph? What does the beast implied represent? And the pit he was cast into and came back out alive? What about the silver his Jewish brothers sold him for? And finally, why didn't his own countrymen recognize him when he was as a king to Egypt? And what does it mean for them to recognize him the second time as the savior of the Hebrews?