Not really. There are plenty of fish that are just as hard to catch, if not harder than the Big Fish. There are items that drop from maps that are rarer than Unhidden Maps. There is nothing rare about the Ixali questline items, they are simply made for the questline. The green does not denote how rare something is, just how it is gotten as compared to other items of that type. If some greens just so happen to also be rare, so be it. It is not what makes them green.
