Mark tells us that Jesus restricted this knowledge to the disciples because he didn't want anyone else to know it. I'm wondering if he really needed to be so restrictive about the information. After all, the disciples not only did not understand what he meant; they were afraid to ask him to explain it all to them.
Something apparently they did understand was priority. They argued about who was the greatest. Jesus answered this concern by giving a lesson and an example. An example that told them what greatest meant to him.
He said "Whoever wants to be first must be last and servant of all." He then showed them a little child and said, "When you welcome the weak and defenseless, you are welcoming me."
Not only are we great when we help the weak, we also see him in the weak.