I watched the recap by London and her sister Chase, where Scott was also a guest and I can tell you they definitely deserved to win. Not just deserved, but they were hands down the smartest racers in the finale.
Besides checking-in their bags, Scott & Brooke wrote down notes (what they remembered) from previous TAR's visits to Chicago. Two of the riddle places - the fountain and another one, can't remember which - was already in their minds and they had addresses, thus saving a lot of time. Also, they planned the fastest route to visit all those 3 places, which London admitted she & Logan had not thought of.
Additionally, Scott said that the memory task was probably the easiest aspect they could have been asked for. He had easily memorised all of Brooke & his placements.