How does onPlayerSay relate to a brick?
onPlayerTouch: Player touching the brick
onActivate: Player clicking the brick
onRespawn: The brick respawning
onPlayerSay: A player in the server saying something
Which bricks would it trigger on? Events on all 20,000 bricks in a large server could be laggy.
Also, for "onPlayerSay [something] -> Events" you'd need something like
this.