This is good evidence right up until you destroy your own case:

"Quirrell expected Harry to become a Dark Lord when he spoke with him after the first class and was surprised that Harry aspired to science."

Surprise that Harry aspired to science is not what someone who had been regularly communicating with Harry for a decade would experience.

On the other hand, you're firing with some fully automatic plot-armor-piercing bullets, there. Quirrell's primary motivation is clearly to groom Harry for some future, so if he waited to start doing so until Harry entered Hogwarts, why did he wait?

My favorite theory (Harry is an amnesiac transfer of Voldemort, Quirrelmort is just a horcrux) is only slightly better here. In this case Quirrelmort wouldn't anticipate how much a happy childhood might change Voldemort's personality and wouldn't see the need to remold himself until after that first encounter. That still doesn't explain why he wouldn't even check in on himself for a decade. It took that long for the "mort" part of Quirrelmort to take full control? Or maybe after taking control Quirrelmort knows he only has a year's worth of activity before decaying away, so he chose to save it when he would have extended contact with Harrymort and the latter would be studying magic?