^I think you need to remember that it's clear from the game's title alone that there would be emphasis on the earlier storylines. So even if it does extend to the Grand Line adventures, the whole point of the plot is that we're following Luffy's adventures from the
very beginning. There's no point establishing that fact if the opening trailers exclusively focus on footage from later, action-heavy arcs like Enies Lobby or Marineford.
