Why didn't Christ just say it out as it was, since He knew these people, wouldn't get what He meant?
John 2:19-22
New International Version
19 Jesus answered them, “Destroy this temple, and I will raise it again in three days.”
20 They replied, “It has taken forty-six years to build this temple, and you are going to raise it in three days?” 21 But the temple he had spoken of was his body. 22 After he was raised from the dead, his disciples recalled what he had said. Then they believed the scripture and the words that Jesus had spoken
John 2
18 Some Jews said to Jesus, “Show us a miracle as a sign from God. Prove that you have the right to do these things.”
19 Jesus answered,
“Destroy this temple and I will build it again in three days.”
20 They answered, “People worked 46 years to build this Temple! Do you really believe you can build it again in three days?”
21 But the temple Jesus meant was his own body. 22 After he was raised from death, his followers remembered that he had said this.
So they believed the Scriptures, and they believed the words Jesus said.
Mark 14
55 The leading priests and the whole high council tried to find something that Jesus had done wrong so they could kill him. But the council could find no proof that would allow them to kill Jesus. 56
Many people came and told lies against Jesus, but they all said different things. None of them agreed.
57 Then some others stood up and told more
lies against Jesus. They said, 58 “We heard this man say,
‘I will destroy this Temple built by human hands. And three days later, I will build another Temple not made by human hands.’” 59 But also what these people said did not agree.
60 Then the high priest stood up before everyone and said to Jesus, “These people said things against you. Do you have something to say about their charges? Are they telling the truth?” 61 But Jesus said nothing to answer him.
The high priest asked Jesus another question: “Are you the Messiah, the Son of the blessed God?”
62 Jesus answered, “Yes, I am the Son of God. And in the future you will see the Son of Man sitting at the right side of God All-Powerful. And you will see the Son of Man coming on the clouds of heaven.”
63 When the high priest heard this, he tore his clothes in anger. He said, “We don’t need any more witnesses! 64 You all heard these insults to God. What do you think?”
Matthew 26
59 The leading priests and the high council tried to find something against Jesus so that they could kill him. They tried to find people to lie and say that Jesus had done wrong. 60
Many people came and told lies about him. But the council could find no real reason to kill him. Then two people came 61 and said, “This man[e] said, ‘
I can destroy the Temple of God and build it again in three days.’”
62 Then the high priest stood up and said to Jesus, “Don’t you have anything to say about these charges against you? Are they telling the truth?” 63 But Jesus said nothing.
Again the high priest said to Jesus, “You are now under oath. I command you by the power of the living God to tell us the truth. Tell us, are you the Messiah, the Son of God?”
64 Jesus answered, “Yes, that’s right. But I tell you, in the future you will see the Son of Man sitting at the right side of God. And you will see the Son of Man coming on the clouds of heaven.”
65 When the high priest heard this, he tore his clothes in anger. He said, “This man has said things that insult God! We don’t need any more witnesses. You all heard his insulting words. 66 What do you think?”
The Jewish leaders answered, “He is guilty, and he must die.”
67 Then some there spit in Jesus’ face, and they hit him with their fists. Others slapped him. 68 They said, “Show us that you are a prophet,[f] Messiah! Tell us who hit you!”
I think the people understood that he was talking about his Body. Because when on trial people came there tell he opposite as a lie, knowing they were telling a lie. There is a statement that he spoke in parables, that others did not understand. So, that when he rose again people would make connections to what he said. 
