Analysis of Leave the Crowd

We stand alone, but in a crowd
Thirteen of us isolated from the world
A stranger, once our friend
Returns to us
But do we want her back
After she left us alone in this crowd?
A young boy follows her
She says that he needed her more
Because he was alone
With not even the unwanted crowd
My twin and I welcome her back
While the rest of them shun her
And now they shun us too
But we don't care now
Because instead of the hated crowd
I have my twin, our friend
And now, her younger brother