I voted the deep shot to Keon. If you watch Allen, and then the replay that shows Keon, Allen communicates to Keon, with one quick point, for him to extend the route, and keep running, and Allen lasers it to him. Amazing athleticism, and improvisation to extend the play, amazing communication between Josh, and Keon, amazing throw, and an amazing catch.
But, if I were to vote on best play design, and execution-- the spin, and shovel to Shakir for the TD was art.