Has Anyone Actually Looked at the Context of Mark Chapter 9 and 10 to Decide if it Really is Incomplete?

I don't think most readers have ever looked at the stuff which precedes the section of text in Mark where the Letter to Theodore says that 'additional material' originally stood? It all seems disjointed. I can't believe that anyone would doubt that something is missing here. The narrative has more holes than a slice of Swiss cheese. As John Dart notes "Biblical Mark's 10:1 had hardly met expectations for a tightly written chiastic center. It lacked catchwords and motifs to signal a pivotal shift." Now take a look at the section as a whole noting the emendation of Baarda with respect to 'the baptism by fire' in Mark 9:49:

If your hand causes you to stumble, cut it off. It is better for you to enter life maimed than with two hands to go into hell, where the fire never goes out. And if your foot causes you to stumble, cut it off. It is better for you to enter life crippled than to have two feet and be thrown into hell. And if your eye causes you to stumble, pluck it out. It is better for you to enter the kingdom of God with one eye than to have two eyes and be thrown into hell, where “‘the worms that eat them do not die, and the fire is not quenched.’

Everyone will be baptized with fire.

Salt is good, but if it loses its saltiness, how can you make it salty again? Have salt among yourselves, and be at peace with each other

Jesus then left that place and went into the region of Judea and across the Jordan. Again crowds of people came to him, and as was his custom, he taught them.

They asked him, “Is it lawful for a man to divorce his wife?” “What did Moses command you?” he replied. They said, “Moses permitted a man to write a certificate of divorce and send her away.” “It was because your hearts were hard that Moses wrote you this law,” Jesus replied. “But at the beginning of creation he made them male and female.’‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh.’ So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.”

When they were in the house again, the disciples asked Jesus about this. He answered, “Anyone who divorces his wife and marries another woman commits adultery against her. And if she divorces her husband and marries another man, she commits adultery.”

 People were bringing little children to Jesus for him to place his hands on them, but the disciples rebuked them. When Jesus saw this, he was indignant. He said to them, “Let the little children come to me, and do not hinder them, for the kingdom of God belongs to such as these. Truly I tell you, anyone who will not receive the kingdom of God like a little child will never enter it.” And he took the children in his arms, placed his hands on them and blessed them.

As Jesus started on his way, a man ran up to him and fell on his knees before him. “Good teacher,” he asked, “what must I do to inherit eternal life?” “Why do you call me good?” Jesus answered. “No one is good—except God alone. You know the commandments: ‘You shall not murder, you shall not commit adultery, you shall not steal, you shall not give false testimony, you shall not defraud, honor your father and mother." “Teacher,” he declared, “all these I have kept since I was a boy.” Jesus looked at him and loved him. “One thing you lack,” he said. “Go, sell everything you have and give to the poor, and you will have treasure in heaven. Then come, follow me.” At this the man’s face fell. He went away sad, because he had great wealth. Jesus looked around and said to his disciples, “How hard it is for the rich to enter the kingdom of God!” The disciples were amazed at his words.  But Jesus said again, “Children, how hard it is to enter the kingdom of God! It is easier for a camel to go through the eye of a needle than for someone who is rich to enter the kingdom of God.”

The disciples were even more amazed, and said to each other, “Who then can be saved?” Jesus looked at them and said, “With man this is impossible, but not with God; all things are possible with God.” Then Peter spoke up, “We have left everything to follow you!” “Truly I tell you,” Jesus replied, “no one who has left home or brothers or sisters or mother or father or children or fields for me and the gospel will fail to receive a hundred times as much in this present age: homes, brothers, sisters, mothers, children and fields—along with persecutions—and in the age to come eternal life. But many who are first will be last, and the last first.”

They were on their way up to Jerusalem, with Jesus leading the way, and the disciples were astonished, while those who followed were afraid. Again he took the Twelve aside and told them what was going to happen to him. “We are going up to Jerusalem,” he said, “and the Son of Man will be delivered over to the chief priests and the teachers of the law. They will condemn him to death and will hand him over to the Gentiles, who will mock him and spit on him, flog him and kill him. Three days later he will rise.

I simply don't see why it is that any scholar would deny the possibility that there is missing information in this material.  It reads rather disjointedly now.  It is difficult to believe that Mark just happened to be a bad writer ...