The Ari was the first Kabbalist whose soul revealed reality in a form that was directed at correction. However, this was merely a revelation of the method, rather than the implementation of connecting souls and the realization of the unity of souls. In other words, the Ari revealed the entire method of correction, in potential, but the implementation and realization of the method needed to occur in due time. People needed to be ready to receive it and many years were required to reach this readiness.
If our main group has already achieved a state where we are ready to accept The Zohar, then the rest of the world will also embrace it because they will simply absorb the entire preparation that we have already gone through.