They did not even realise the son of man was the suffering servant.
Jesus kept saying the son of man must die, and be risen back up. they denied it and even fought him concerning it.
it was not until after his ressurection that he opened their eyes, and they understood it.
You know a point often overlooked for sure.......The best preacher in the world and that the world has ever seen or will see and the saved disciples sometimes had a difficult time understanding the word and or significance of what was being taught......another point is that unless Jesus opens your eyes to something, you will be oblivious and blind unto it no matter what is said and or done........just a point to ponder.