It is too complicated, and also my knowledge of HPMOR is suboptimal. (I forgot many parts, didn't read it again, and I have read other fanfics meanwhile. Also in the discussions about HPMOR I regularly read insights that I have completely missed.)

"You know, boy," Professor Quirrell whispered, "I had thought... to teach you everything... the seeds of all the secrets I knew... from one living mind to another... so that later, when you found the right books, you would be able to understand... I would have passed on my knowledge to you, my heir... we would have begun as soon as you asked me... but you never asked."

This also contradicts my theory, unless Quirrell is planning to yet give Harry a last-minute ultra-compressed lesson.

By the way, how much human education is necessary to overcome the Interdict of Merlin? Because the students still have to study the books, don't they? Could teachers just give 1% in speech and let them learn the remaining 99% from books? Could Quirrell give Harry the 1% of everything in this final lesson? His flaunting of overpowered magic could be an introduction to this lesson. Also he made sure they have enough time.

Okay, here are a few silly numbers:

• Quirrell is Riddle's non-destructive copy, Harry is the destructive copy -- 10%
• Quirrell "wants" his body to be killed by Harry, without possessing Harry in turn -- 50%
• there is a spell/curse/oath (other than prophecy) that forces Quirrell to decide suboptimally for his survival -- 10%
• Quirrell could not kill Harry (with gun) and survive, if Harry now refused to obey him -- 30%
• the mirror (or the room with the mirror) contains Riddle's memories -- 30%
• Dumbledore suspects that Harry is Riddle, and expects him to reach the mirror -- 70%