Yes, Jesus is the one and only, unique Son of God, but Jesus
never, ever says that anyone else "can be the Son of God," ever. There are two significant problems there. First, we can only be "a" son (or daughter) of God, never "the" son of God. And, second, only Jesus is the Son of God. Both you and
LeviR need to be
much more careful with when to capitalize "Son" and when not to. There is a reason the NT does it and we need to follow that convention. It's exactly the same difference between saying "a god" and "the God."
It absolutely is a claim to be equal to God, to the Father, as the Jews fully understood:
Joh 10:30 I and the Father are one.”
Joh 10:31 The Jews picked up stones again to stone him.
Joh 10:32 Jesus answered them, “I have shown you many good works from the Father; for which of them are you going to stone me?”
Joh 10:33 The Jews answered him, “It is not for a good work that we are going to stone you but for blasphemy, because you, being a man, make yourself God.” (ESV)
Jesus's argument is that
if even the Judges were called "gods," being humans with God's divine authority to speak and act on his behalf,
how much more is he actually God because he is
the Son of God. That it isn't blasphemy
in regards to himself is precisely because he
is God and equal to the Father. It
would have been and
would be absolutely blasphemous for anyone else to claim to be the Son of God in the very same sense that Jesus claimed to be.
John has already stated this:
Joh 5:16 And this was why the Jews were persecuting Jesus, because he was doing these things on the Sabbath.
Joh 5:17 But Jesus answered them, “My Father is working until now, and I am working.”
Joh 5:18 This was why the Jews were seeking all the more to kill him, because not only was he breaking the Sabbath, but he was even calling God his own Father, making himself equal with God. (ESV)
Those are John's words, yet he doesn't at all refute the idea. And, he has also already recorded Jesus's explicitly claiming to be God:
Joh 8:57 So the Jews said to him, “You are not yet fifty years old, and have you seen Abraham?”
Joh 8:58 Jesus said to them, “Truly, truly, I say to you, before Abraham was, I am.”
Joh 8:59 So they picked up stones to throw at him, but Jesus hid himself and went out of the temple. (ESV)
Again, Jesus is comparing the temporary existence of Abraham with his own timeless existence. He didn't even say, "I was," as though he merely existed before Abraham. John the Baptist knew that Jesus (the Son) existed before he did, although John was born first:
Joh 1:15 (John bore witness about him, and cried out, “This was he of whom I said, ‘He who comes after me ranks before me, because he was before me.’”)
...
Joh 1:29 The next day he saw Jesus coming toward him, and said, “Behold, the Lamb of God, who takes away the sin of the world!
Joh 1:30 This is he of whom I said, ‘After me comes a man who ranks before me, because he was before me.’ (ESV)
That was three attempts at stoning Jesus for blasphemy. Claiming to be God in human flesh, claiming equality with the Father,
if one wasn't actually so, would be blasphemy. And, that was the claim that eventually led to his crucifixion:
Mat 26:63 But Jesus remained silent. And the high priest said to him, “I adjure you by the living God, tell us if you are the Christ,
the Son of God.”
Mat 26:64 Jesus said to him, “
You have said so. But I tell you, from now on you will see the Son of Man seated at the right hand of Power and coming on the clouds of heaven.”
Mat 26:65 Then the high priest tore his robes and said, “
He has uttered blasphemy. What further witnesses do we need?
You have now heard his blasphemy. (ESV)
Not only does Jesus admit to being the Son of God, again claiming equality with God, he then claims the position of dignity and honor and says they will see him "coming on the clouds of heaven." In other words, they will see him coming as King and judge, whether it is to judge them and Jerusalem for rejecting him or the final judgement, or both.
All it means, as shown in particular context, is that these were mere humans who were chosen by God to be his representatives and judges, and that there judgements were to be considered as his judgements. Never does it mean that any such person was a god in any actual divine sense, as the Son of God is. That is, for humans it was merely a title conferred by God; for Jesus, as the one and only Son of God, it is a title that actually reveals his deity.