I really like your theory of what happened, but have a different idea about Tom's motives. When the hero disappeared, people were already speaking of him as the next Dumbledore. He had two easy paths to world domination. Put yourself in his place and his personality, what would you do? I'd probably get bored and set about creating the only thing I don't have: a worthy adversary. This also explains why Harry Potter is so overpowered.
set about creating ... a worthy adversary
Just to put slightly differently what others have already said: We're talking here about a version of Voldemort who has read the Evil Overlord List (or written his own version or something of the kind). It is hard to reconcile either half of that with taking considerable trouble and risk to raise up a "worthy adversary".
The next discussion thread is here.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 84. The previous thread has passed 500 comments. Comment in the 14th thread until you read chapter 84.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: