page 3: "Wow, we know the whole list of items this person we are specifically targetting need, and we have blocked almost all places were he could get those. What do you say boss, should we go and block another place, so that he has absolutely no way to reach the requirement of 3 items?"
I guess the mountain could not be ""defeated"" in the same way as the other dungeon could, because it is a place and the item needed aren't dropped by monsters but instead gathered (even thought the other locations for the Krummel fruit were subjugated?), and that is why the weather gal is there to disrupt the chances for him, but why not go the extra step and subjugate the place for Salazar's hairpin? Was that place in their newbie's list too? Then make her subjugate that dungeon, or just do it after she got what she wanted.
Unrelated by that, what was blocking participants to just buy those items? Yes, the guild hold the first buy on that, but from previous discussion it seems that they only buy the prime materials, and retails is handled by others. Other than that, there doesn't seems to be anything to stop adventurers to sell their loot independently (which is what MC should have done already for his more rare items, like mandragola and the soul stone)
In another point, had the leader of the clan already dispatched members in ANY dungeon in the area around the town? Because he didn't got the exact list until the exam started, and the auto travel has always seem to be faster than normal travel. I guess it still make sense, since they aren't specifically targetting MC, but every participant. Though they still need to have started after the handle of the list, as they probably didn't went to subjugate the place where their newbie needed to do her task. Some sort of long-distance comunication maybe?