The legendary ranking is a bit different than other upgrade finder rankings. Read more about it here: Shadowlands Legendary Rankings
Short version: it’s more of an “absolute” ranking, because people generally want to plan ahead with their legendaries rather than see something specific to only the gear currently in their bags.
We show the 225 version because… we have to show a version! It doesn’t really matter that much, the ranking is more about the power of the legendary effect, and a suggestion about which secondary stats to put on it.