About the Land of Dragon Crystal
I checked the data carefully, and there is no clear statement in the data that the Dragon Crystal Land "has just been formed".
My statement that the Dragon Crystal Land has not yet been formed at this time is mainly because the Grand Leader discovered this crystal after the melting of the mountain dragon in the plot, and everyone in the investigation team was very surprised.
The Grand Leader has been tracking the Exterminating Dragon for decades, and it stands to reason that he should have been to the Dragon Crystal Land, so I think the Dragon Crystal Land has only become like that recently in the MHW plot.
However, the two points mentioned by the book friends are very reasonable. One is that the scale of those crystals does not seem to be formed in a short period of time, and the other is that the fat house eats crystals. (Especially the latter, which is very clear in the ecology)
Considering the rationality comprehensively, I will modify the follow-up.
Modify it to Dragon Crystal Land already exists, but it is located in the core area with the densest and most dangerous ancient dragons. The environment is very closed. No one in the investigation team has arrived at this time. It was the geological changes caused by the melting of the mountain dragon that opened a corridor, and the Grand Leader was able to arrive.
So no one knows.
At the same time, this kind of crystal also exists in the area outside the Dragon Crystal Land, but it is very fragmented, not everywhere like the Dragon Crystal Land. (This setting is to give the fat guy a way out.)
The approaching hatching of the Dark Dragon eggs and the active energy will accelerate the growth of crystals.
As for why the investigation team failed to connect the small crystals on the periphery with the large crystals in the Dragon Crystal Land, emmmmm, I am a hen.
Just like when you see a mung bean or soybean-sized crystal, you will think it is a diamond, and when you are given a human head-sized crystal, you will subconsciously think it is something else.