role of Moshiach

In Likuttey Torah the Alter Rebbe defines the role of the various events leading up to the giving of the Torah and their parallels in the Prophesied deeds of Moshiach. Just as Moshe brought our people across the sea , so too, will Moshiach lead us all across the Euphrates River.
There is a symbolism associated with transversing a body of water prior to a major revelation.
However it goes beyond symbolism for motivation and insight. rather, the symbolism actually
represents a change in our relationship with G-d, the world and with each other. the breach of the sea allowed us to receive the Torah. Similarly , the breach of the river will allow us to receive the hidden Secrets of the Torah through Moshiach.
Now this seems strange. What is the function of the giving of the Torah that it requires such a magnificent preparation? After all , the Torah is G-d's laws for our betterment. Why the Fireworks?
We are connected to all of the spiritual words above us , even as we exist down here. If so why can't we breach these spiritual levels? The answer given is that we are constrained by G-d's "speech". This "speech" power is also the source of our water bodies and functions in a similar manner. In the seas there are creatures and landscapes similar to what exists on dry land. It's invisible to us because the water covers them. In a similar vein, the spiritual source for everything physical exists in the realm of G-d's "speech" also called Malchut. However, the power of "speech" covers the G-dly power or source of the physical. So, in essence in order to become aware of our source we must be able to broach the power of "speech". In breaking through , the "speech" can no longer conceal what it contains.
This is the mystery of the Splitting of the Sea. At that time the spiritual sea or "speech " split and no longer concealed its' content. In other words we received access to the content within the "speech" so that we could become enlightened by the Divine content within the "speech" . The broach of the power of "speech" is only the introduction to the giving of the Torah. For the real message of the Torah lies in its' Divine Communication. Access to this information can only be received if we are spiritually in tune with the Torah. However , until the splitting of the sea we couldn't access the content within the "speech".
So what will Moshiach do that the Prophets and the Tannaim couldn't ? The answer is that
Moshe broached only the "speech" and we can access the content within . Moshiach will broach the River of G-d's "thought" which will open up an altogether different level of Divine Wisdom.
This is similar to the story of the ARIZAL who fell asleep during the daytime on Shabbos Parshas Balak. Seeing that he was moving his lips the students tried to snatch the Holy Words. This stirred him to waken. Seeing that the students' ears were next to his lips, the ARI laughed.
What i just saw revealed would take me 80 years to explain! Now to absorb 80 years of information in 15 minutes seems like a0n impossibility for a human. What happened with the ARI was that he penetrated the limits of "thought" and learned by sight. This is the representation of the river Euphrates. It stands for the communication of the Divine "thought". The breach of their limits of thought will allow us to learn by "sight'. Indeed, this is the role of Moshiach . He will break the boundary of thought and teach the Torah by Vision.
This is how Moshiach will be able to teach Moshe and all the Torah Giants who know the entire Torah. For what can Moshiach add to their knowledge? The answer is that they will now study the secrets of the Torah beyond the limits of the thought process that limited their access to the infinite.
This is the mystery of the maxim that Moshiach will not add to the Likuttey Torah. Rather , through Moshiach we will be able to see that which we thought of in our lifetime.