Maybe the degredation in that body's condition is due to being in constant close proximity to Harry Potter, or something.
One idea I like is that his problem lies in having his soul bound to an object a cosmic distance away from him, which makes the body-soul connection increasingly difficult to maintain.
Also, that may not even be Quirrell's body, Quirrell may be long dead and this is just some poor schmuck Voldemort decided he could pass off as Quirrell.
In canon, Quirrell's identity was relevant because he had been the Hogwarts Muggle Studies teacher before being possessed by Voldemort. Since this is not the case in HMOR, Quirinus Quirrell basically is "some poor shmuck" - there is no reason why anybody would wish to falsely assume his identity. Had Voldemort possessed, say, John Smith, he would simply enter Hogwarts as John Smith.
Blaming the Pioneer Plaque for the progressive degredation sounds like it makes sense at first, but the point of the Pioneer Plaque thing is that this Voldemort is supposed to be smarter than canon Voldemort, and a Pioneer Plaque horcrux superior. That theory makes the Pioneer Plaque horcrux inferior. Also I'm pretty sure Voldemort has other horcruxes, including Roger Bacon's diary and quite possibly ones hidden in the other locations Harry suggested when discussing how to get rid of a Dementor.
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 95. The previous thread has passed 300 comments.
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, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.
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: