Hi Dwight, if. that is. your real. name,
I agree, in English, there can be many items within a grouping of the highest, compared to all others. However, when one states "What is the highest mountain?" I believe the typical expected answer is going to be a singular response. If there were two mountains of exactly same height, then one would likely say, "Well, there are actually two highest mountains" but it would be weird to insist then that one of them remains "the" highest "mountain." Grouped, they are "the highest mountains" plural, but not singular. The fact that "the" can mean other things in different language contexts is irrelevant. We can be pretty sure it means something in this context and that is the singular "resource." The Agenda does not say "one of the highest resources," for example, it says "the highest resource." I believe a common person reading of this is a singular response, i.e., that the CL is expected to create a singular highest resource.
Of course, language is merely a way that two people communicate meanings and assumes the two people have similar enough meanings assocated with those words to convey this. As you point out, different education and bias can create different meanings. I am not educated to think in terms of computer science, math, etc as a basis for the language meaning of "highest."
What did the writer of the Agenda mean when he wrote this? You wrote: "If they wanted it to be exclusive, they could have added that one word. If the FAQ states that it has to be exclusive, then the card wasn't clear and now we know what it actually means." Well, to be clear, I am the 'they" in this sentence, as I wrote the agenda. I made it up. It's an agenda I added to the game for our game group with the consent of the group, after everyone had a chance to read them - not that we ever went over the cards to be sure we all agreed as to what they meant, I guess (who would take the time?). I fully intended it to use the meaning I've stated, without intent of any kind of alternate mathematical or semantic variations, such as "what is the max?' or "what is the highest relative to their percentage of the original starting value" or any other potential meanings. I don't know why anyone would ever write a rule with the intention of allowing for that. Instead, I was just try to improve our Agenda varierty. What happened was that once the Cylon Leader revealed that he "won" on his Agenda, I said, "Sorry, no, that is not what that means," and the debate began.
Probably this wouldn't have gotten so meaningful, except that the CL had been the one who ended the game by using the location Caprica to choose from one of two Crisis cards and made this choice - ending the game with a jump icon card rather than extending it with an Attack card - because he believed it was okay if he had Morale "tied for highest" rather than "the highest resource." So, the reading was impactful on everyone's immediate win/loss, not just his own.