Well, the "theory" of equilavent trade is given in the beginning by Ed because he's still in his world right? But in the end, Al continues the "theory", but it becomes a "law" because Ed is no longer in his world anymore.
Sorry if that's confusing. @_@; To make it short, you know how Chemistry have these things called "theory" and "law." A "theory" is a rule that people aren't sure if it's true or not, so it always changes. A "law" is a rule that's already been proven to be true all the time, so it's always stays the same.
So anyway, do you think it's good to think that Ed says the stuff in the beginning in the dubbed and have Al end it?
*runs off and tries to work on her essay* @_@;