It seems that even in thoughts and prayers, poor Sam is thought of as "lesser than" Frodo, if even included whatsoever:
All now took leave of the Lord of the City and went to rest while they still could. Outside there was a starless blackness as Gandalf, with Pippin beside him bearing a small torch, made his way to their lodging. They did not speak until they were behind closed doors. Then at last Pippin took Gandalf’s hand.
‘Tell me,’ he said, ‘is there any hope? For Frodo, I mean; or at least mostly for Frodo.’
Gandalf put his hand on Pippin’s head. ‘There never was much hope,’ he answered. ‘Just a fool’s hope, as I have been told.
Later, I believe that even the book itself refers to "Frodo", as if he's on a solo mission. But it's far more serious when a "great friend" of his (Pippin) thinks "mostly" of Frodo.
Why is Pippin thinking "mostly" of Frodo, and ignoring Sam? Or have I misread it completely?