I'm not saying it has to be a situation where the mentor "scripts" the mentee's moves. Plainly that would be educationally unhelpful and also probably crosses the line into cheating. I am talking about how serving as a second set of eyes, or a sounding board, what-have-you, for another player is going to affect that player thinks, communicates, and ultimately moves. In the hypothetical case of Ruffaus mentoring a brand new player, yes, it could be an instant and dramatic improvement in the player's quality of moves and diplomacy. Ruffhaus or any top player are the kind of diplomats that can singlehandedly alter the course of an entire game. Even the sudden appearance of an average-quality mentor could wind up having a profound effect on the countries in the student-player's local sphere (say in a game of WWIV)
Where is the problem in doing a post-mortem analysis of a Diplomacy game? The orders, maps and messages are all on record. A mentor can flip back through the student's game and offer perspectives on what the student could have/should have done or thought about in a given situation. This is exactly the way I used to analyze my chess tournament games with my coach. I didn't have him over my shoulder at the tournament hall giving me advice while I was playing.
I'm not saying I don't agree with being a mentor. On the contrary, I think it would be great fun to supervise someone else's game, even as it was ongoing. I'm just not sure it would uphold the integrity of the game to do so given the setup we have on this site where every game is rated and everyone operates on the assumption that people are playing for themselves. As Ruffhaus is one to typically stand up for integrity in diplomacy I am surprised to see him arguing here that no rule -- written or unwritten -- stops a top player from giving advice to a newbie DURING an ongoing game. Then who's to know if that rookie we're playing isn't really rookie + Ruffhaus, or Retillion. At a minimum, the presence of any such relationship would have to be very public and also factored in accordingly with the ELO rankings. And the idea of employing ad-hoc mentors not publicly accountable to anyone through the use of a forum or PMs would just lead to a metagaming nightmare. Is this a risk we're willing to take for the chance of improving the quality of some new players? This is something that if taken to an extreme really could ruin the entire ethos of diplomacy. To me, the solution is simple: render any and all advice after the game is over. This should pose no trouble for a committed student.