Jimmy, the Concordance was originally designed to help one of our academic users create a concordance of the Dead Sea Scrolls for print publication. By entering an asterisk wildcard, you could find every word in a passage and then build a concordance. That's what Helen meant by "intended to take a passage and concord every word in it." The fact that the concordance is built as the result of a search means that you can do more than just concord every word in a passage. You can create all kinds of concordances depending on your search.
Now, we could certainly expand the capabilities of the Concordance, but I want you to understand that the current behavior actually is consistent with the other Analytics. When you do a search, Accordance takes the list of words found and concords each of those words. When you enter a search for the English word "power," it concords that one word. When you search for a Strong's number, you get all words tagged with that Strong's number, and the Concordance concords all those words. That admittedly is confusing, because from your perspective you have only searched for one Greek word and you want that one Greek word concorded in the same way "power" is. However, the Key Number is actually a tag, and the result of that tag search is a list of English words which have that tag.
Compare that to a search for a grammatical tag in a Greek text. If I search for [NOUN], Accordance returns a list of lexical forms which have been tagged as nouns, and the concordance then concords every occurrence of each of those Greek lexical forms. That behavior is pretty much what one would expect. Now, if I search for something more specific like [NOUN accusative] and Accordance concords every occurrence of each noun, including occurrences which are not accusative, that is likely not what one would expect, but the behavior is consistent in that it is simply taking the list of words found and concording every occurrence of them. Perhaps we could add some kind of option to concord only hit occurrences, but I'm not sure that's the best way to deliver what you want.
What you really seem to be wanting is an enhancement to the Analysis that would list all the verses in which each form is found. First, note that the behavior of the Analysis is actually essentially the same as the Concordance in that it lists each word found by the search. If you search for "power" you'll get each form of power (assuming you did a Flex search), under which will be listed each Key Number. If you search for [Key G1411], you'll get each word tagged with that Key number, under which will be listed that Key number. It is still the English words which are primary. Now, we've added an option to Sort by Key Number, so that you can make the Key Number appear primary.
The obvious question which the Analysis does not currently answer, and which you are trying to use the Concordance to answer, is "Where (i.e.: in which verses) is each form found." I think if we added a Show verses option and the Analysis gave you a list of verses in which each form was found, that would be a simpler and more intuitive way to give you what you're looking for. I've actually pushed for that in the past, but I don't always get what I want right away either!
In the meantime, you can answer that question for particular forms listed in the Analysis by triple-clicking them. So, for example, if you have this Analysis of G1411:
G1411 dunamis δύναμις = 118
ability = 1
meaning = 1
means = 1
If you triple-click the word "means", Accordance will automatically format a search that shows you that dunamis is translated as means in 2 Corinthians 8:3.
I hope that helps.