That is mostly correct. The Ravana was the destroyer that managed all the assets we had found and fought before in Lion's Door and Mystery, its presence was inferred by High Command and the Big Hunt was the hunt for the Ravana (and not the mere cruisers, as Orpheus pointed out). Once it is found, we destroy it. The Ravana arc is not just two missions, but four. I said "mostly" because one could have designed a mission where we would not be able to destroy the Ravana in time (it fled, etc.). I am also skeptical that the dragging of this little arc would have accomplished much. While I agree that some of these arcs are too quick, adding one, two, three missions here and there in a campaign that already has 30 missions is just too much IMHO.