This is a long post!
The bigger problem is actually why Covenant looks like one of the Lords' producing species rather than like a Cavewight. Covenant should have dragged Ookie, Drool's little missus down some dark tunnel to satisfy his craving, not Lena. So going along with this line of thought either the acclimatization process takes time and Covenant became humanish during the first dazed minutes on top of Kevin's Watch with Lena or Drool believed that the White Gold Wielder wood look the same as the Staff of Law wielders.
Oh come now! Covenant resembles Foul because Foul is an externalization of his flaws, or something like that - Covenant said so himself, and he is the white gold! And Foul somewhat resembles the Lords, because he infiltrated them at some point in the past, which is the case because he is sending Covenant to infiltrate them now, or something. Also he resembles them because pretty much anytime The Creator makes something nice or The Land evolves something nice, Foul goes and mucks it up. Believe me, I don't have any justifications except thematic roundabouts, but I'm sure what I'm saying makes sense.
I'm a little confused as to whether you mean Lords' or Landfolk. But, as to why he does, it's fairly simple IMO from a narrative point of view. If Covenant looked like a wight, why would Foul send him from the Wights to Revelstone with a message? Moreover, why would Drool be worried he would take the staff from him (in particular?). Unless Covenant was one fine figure of a Wight, Drool would just say "back in the tunnels with ye" and probably be less likely to credit he was in some way "different." This is, again, a "everything must be obvious to everyone when it is to be followed up immediately" way of looking at the books, I think.
As far as the difference between TC's world and ours, it seems somewhat like disputing a difference between the different worlds we all live in. While we can accurately say there are things that happen that wouldn't really happen, I think his environment is comparatively closer to one we can reach and interact with...?
I admit, I've never come into immediate contact with a rattlesnake.
Conceivably, the Creator could have created the world in such a way as to ensure Covenant could understand the language. Built the world "for" him. He certainly interfered with his creation during the creation phase. He gave it gravity Covenant could cope with, air Covenant could breath, food Covenant could eat, germs Covenant could resist, temperatures Covenant could be comfortable in, etc. Why is giving it a language Covenant could understand out-of-bounds?
This perhaps suggests to much purpose on the part of the Creator (?). I certainly know little of what it is to craft a real, breathing world on such a scale, and I'd suppose you know little of it as well.
But it may well be that the Creator has limits - I certainly don't believe that he suggests otherwise - and that a certain framework and such are the natural results of his limits. His decision to employ the agent of another world, who can survive within his world, may have been the result of convenience, unless the Creator ministers fully over every world. Foul, who professes a desire for certain perfections, may well be frustrated by the limitations which complex life given comfort places on its surroundings. I don't feel like going further into the questions of whether Foul and the Creator are the same entity - I think what I've said can be maintained as a possible counter, without really bothering to decide something no one can be sure they've figured out (can we really trust these high entities that are in opposition to give straight answers?).
Orlion wrote:Something else: we do not know the content of the books Covenant wrote to begin with. Could be they were fantasy books
I feel like you should know this XD but we know a tiny bit...
Covenant wrote one book prior to contracting leprosy, which (after treatment, divorce, etc.) he saw as ridiculously pretty and optimistic and consigned to the fire, along with his second work. He also wrote some other more seemingly gloomy ones, IIRC.
I always see it as some amalgam of 'catalytic' and 'analyse' with a dash of 'majestic' and 'mystic'. Just digging a bit more into it it looks like the 'stic' ending is related to a Greek word formation. I'm fairly sure that SRD knows his Greek!
But hey, at least it came to me on my own, right? 
