Was there a point to the other portals if this one is so important? [which is a genuine question and not just snark, even though it's pretty clear he hasn't a clue what the answer might be.]

I'm aware that we're trying to jog the memory of the Librarian, but if each item grows in importance according to the location it's placed, wouldn't it make sense that the item in this portal alone should be enough to work? [not exactly a pleasant thought, especially when people were injured during the first six days.]