I feel I should remind everyone that this clue pertains specifically to the UA's. There is no proof yet that the UA's are connected to the meta-alloys or barnacles. I'm not saying we shouldn't search in Merope, just understand that if anything does come of it, it will pertain to the UA's specifically. If you don't believe that there is a connection, it's illogical to search in Merope.
You are absolutely right, and I was right there with you... until recently.
I mean, we've been wondering why the UAs point at Merope for months. Being cautious science-folk we didn't want to conflate the UA and the barnacle mysteries (although judging by the thread title that's pretty much out the window, isn't it?) Now, MB comes in here and points us to a nebula associated with Merope where these UAs having been pointing all along. It seems pretty obvious to me that Merope is where they expected us to look. Now, obviousness isn't evidence, but we could rule the Merope out with a large concerted effort over about a week or so. That's all I'm trying to build support for. Heck, I can't even participate. And, if you think the answers lie elsewhere then good on you. I hope you find a barnacle first. First biscuit and whiskey on me.