"I know he lives in a modern city. I don't know which one. Then again if there are multiple Matt's then there could be a large number of them living a very similar life in Recolle or another city. What is so special about that specific Matt that Retrospec wants to give me his memories and qualities?"

Well. He can think of a couple reasons this Other Matt would be considered "a special" individual.

"That brings us back to the subject of unusual abilities. This Other Matt had talents I still don't fully understand but valuable skills nonetheless in the right circumstances. Retrospec has chosen a large number of users with super powers and other dangerous skills."