Jesus pulled his disciples aside from the crowd to tell them of his death. Not everyone got the same level of information.
That all the disciples were indignant with James and John shows how little they understood what Jesus teaches in these verses. It is NOT natural to serve. Perhaps their question is positive in some regard. Maybe they understood a glimmer of what it meant to rise again. . . maybe.
Jesus made Bartimaeus, even though it was obvious to Jesus, what he needs. He did not need the information. Even normal people can figure out that a blind person needs to see. Jesus likes to be asked!