Buzzb, I didn't say it was unsolvable. Obviously it wasn't, but a crossword can be solvable yet still be unfair. How is it unfair? I think it's unfair to subject solvers to a frustratingly long and tedious search with precious little in the way of a clue as to what they might be searching for. To judge from this site and AB, those who solved it did so after hours of searching, one solver saying it took five times as long to find what to highlight as it did to fill the grid. ELTON didn't appear to connect with anything in the grid so could have been an accident of grid construction and easily overlooked, especially with the red herring of REVELATION in the title and MISSIVE centrally placed. At least when you look for a needle in a haystack you know what you are looking for. It's also arguably unfair to refer to words in the preamble, when what we have is isolated, scattered letters that form words.
The preamble starts, "To illustrate the theme..." The highlighting doesn't look much like a R....T to me. I might have been more impressed with the grid if it did.
Some might remember Asylag by Elgin, which only 15 or 16 solvers managed to solve, so far tougher than this one. I was not one of them, but I didn't think the puzzle or the endgame unfair when I saw the solution, because it had a thematic logic to it. What's the thematic logic for the presentation of 'words' here?