Now that the topic has run its course:
Debussy is not a composer who can be typed: Essentially, each piece has a concept which must be conveyed by very careful, planned, and controlled use of the keyboard. That level of inventiveness, artistry, and focus on that dimension of the music is what I feel Liszt needs as much as Debussy. For example, the tumultuous waves of sound in the Mazeppa or Chasse-Neige can make many different sounds, and one must choose what one thinks is best.
This is my explanation, and this my claim.
Cheers!
Daniel