The “it’s me thought” comes when something is said or promised without the specific person to whom it is made. Thus, the people involved works towards getting the promise fulfilled to them with a very positive attitude that that gonna be no one else but me.
John Mark introduces us to mark 9:1 with a statement of promise made by Jesus to the disciples not referring to anybody but used the term some. Such a statement is meant to help the disciples to work on their faith in the things of God.
Mark 9:1And he said to them, “I tell you the truth, some who are standing here will not taste death before they see the kingdom of God come with power.”(NIV).
As it is known to many of us whoever these came to be is John who receives the revelation of the end time. But also looking onto the life of the other disciples, they were always determined to walk the path of Christ even to death on a cross like Peter.
Just after the statement Jesus takes Peter, James and John with Him to the mountain where the transfiguration takes place. It is at these point that Moses and Elijah appear and they talked with Jesus regarding the task he was to do in a while. But (slightly out of the topic) beyond talking about that, these denoted a transition or an end to one age to another. To show how great the work “grace” of Christ superseded law represented by Moses and prophesy represented by Elijah.
While, the next seen that followed was the most revealing of who Christ was. When the three disciples represented by peter said we shall build three temples here for Jesus, Elijah and Moses. But the reality is they had no clear understanding of who Jesus was though they had previously said he is the son of the Most High God. They as ascribed Jesus to a worldly king of which he wasn’t and needed no permanent tent whatsoever. And God came over in a cloud covering them and said to them, “these is my son listen to Him”. These few words changed the perception of the disciples there and then. The knowledge they gain in the mountain pertaining Jesus shot their Faith more. It’s after these that Jesus opens up to them about His coming death. NB: transfiguration was the First miracle on Jesus Himself. He was gloried. (You may ask why Jesus asked them not to share it to anyone. The answer was it should have awaited confirmation through His death and resurrection where He was glorified to the heavenly body).

What a coincidence! While all these was happening at the mountain, there had been another scene elsewhere involving the rest of the disciples. Mark 9:14When they came to the other disciples, they saw a large crowd around them and the teachers of the law arguing with them. (NIV).
(Opnion:when I see the teachers of law here, I think they must have had a happy moment engaging the disciples, likes of Judas Iscariot, when Jesus was not around to put the off).
And the big question here is. Why an argument? These is an expression of a faith less people, who are full of evil ambitions, just set to frustrate the disciples.
We may tend to think that the disciples could not do it (heal the boy) but the fact is they could. But then why didn’t they do it?
Mark 9:15 As soon as all the people saw Jesus, they were overwhelmed with wonder and ran to greet him.(NIV).
The people’s including the father to the son had nothing to think of the disciples healing the boy. In other words, they just were trying to see if they can heal the boy. That is why in learning of the Jesus coming, they forgot of them and ran to Him.
To extend the doubt, when Jesus learns of all that was happening, Mark 9:17 A man in the crowd answered, “Teacher, I brought you my son, who is possessed by a spirit that has robbed him of speech. 18. Whenever it seizes him, it throws him to the ground. He foams at the mouth, gnashes his teeth and becomes rigid. I asked your disciples to drive out the spirit, but they could not.”(NIV)
Immediately Jesus heard these, He had these words to say” Mark 9:19 “O unbelieving generation,” Jesus replied, “how long shall I stay with you? How long shall I put up with you? Bring the boy to me.”(NIV)”
Saying these Jesus, Jesus referred to the people’s inability to believe that even in His presence, with faith that it could be done, the disciples could have healed the boy.
How many are those times that we skip God’s deliverance because we think it’s just that man of God you know that can pray for you! How long will they be with us!
Not getting what Jesus had just said, the “religious” father to the boy said, “Mark 9:22 “It has often thrown him into fire or water to kill him. But if you can do anything, take pity on us and help us.”(NIV)”
The appearance of If in the statements shows doubt. And just had not to assume the man was an illiterate to have used the {if}. So He asked. “Mark 9:23 “`If you can’?” said Jesus. “Everything is possible for him who believes.”(NIV)”
Many are the things that we make seem difficult to solve just because of our unbeliever. The son was in pain for a couple of hours just because the father had no hope of his safety. The good news is that despite the difficulty to believe, we have a God who is merciful. He helps us to stand when we seek Him. The father had to then confess of his unbelief and sort Jesus to help him overcome and at these, Jesus heal the boy. “Mark 9:24Immediately the boy’s father exclaimed, “I do believe; help me overcome my unbelief!”(NIV)”