As the greens for most of the incoming holes were originally used for both the front and back nines it is not surprising that they are more interesting than the extensions which created the "double" greens in the mid-19th century. As for 5 and 14, the best of these two was probably the "reverse" 5th as played in the 1840's. The following is from James Balfour's book, commenting on the extension of the course (words in parentheses are my comments/calrifications):
"5. This hole is more altered than any other on the Links, and sadly destroyed. The tee stroke (probably near the site of the current 4th green)used always to be played to the right of the big bunker with the uncouth name (Hell), unless when now and then some huge driver 'swiped over h___ at one immortal go' The second stroke was always to the left on to the Elysian Fields.......... The Third had to navigate the intricate 'Beardies,' and the fourth was across was across a wide, staring, horrid bunker, beyond which was a beautiful putting green (the present 13th)."
The hole was then a huge dogleg par-6, as all of what is now the 5th fairway was impenetrable whins. Now THAT was a great golf hole!