Well, here’s the tricky thing actually, with the new angle we’re taking with the Dagger, it doesn’t really say the “Location of the Wayfinder” anyway. Personally, I still think Sith Runes are enough of a giveaway to accept that the Dagger is important.
Besides, Rey senses something fishy about the Dagger, so clearly it means more than Ochi’s special knife. How many artifacts, carved with ancient Sith Runes, imbuded with pure Essence of Dark Side, discovered near a confirmed Sith Cultist, are we reasonably going to find?
I guess my question to you would be what are the odds that this one random artifact filled with scribbles happens to be the one thing holding the key to finding that particular thing they’re looking for? And why would 3PO, who is all about the odds, be so excited and sure that it is the one thing they needed if he doesn’t know what it says? Even if we remove the location of the Wayfinder from the inscription, 3PO’s reaction to seeing it wouldn’t make sense unless he knows for sure it IS the clue they were looking for.
“To those it chooses” could work, implying that it’ll only choose Rey if she’s evil enough.
But my question to you would be: what are the odds that our heroes are looking for a clue that will lead them to a Sith Artifact; and then they find a Sith Cultist, who has a mythical blade carved in ancient, unintelligible runes, and Rey can sense oodles of Dark Side energy coming from it.
The question is, what are the odds that this isn’t what they’re looking for? Balance of probability, and all of that. “Darn it, Rey, you were supposed to grab the other mythical Dark Side weapon that the Sith Cultist was hoarding in the cave that was emanating Dark Side energy! Doh!”
Like, seriously, how many Sith Artifacts do you think Ochi brought with him into this cave? They’re not exactly growing on trees, ya know? You said it yourself, 3PO is all about statistics. Statistically, how many magical Sith Artifacts are they expected to find?
EDIT: Okay, okay, okay, what if we could make 3PO say, “This must be the clue Master Luke was after”? Would that alleviate your concerns?