Could have fooled me.
For what purpose do most people visit this website other than [keyword] reliable information? But Fine. Dark Fliers are still subjectively, and supported by a vocal minority (they sound educated though, or is that a classic argument from authority fallacy), leaning on the bad side though.
Okay, new stuff then. Vaike should be lower, and Miriel can be debated to go down the same as well. If my assumptions are correct, the reason why both are so high up there is their usefulness early on, namely against knights, or their ability to use 1-2 Ranged weapons early on. But Stahl and Sully both have Discipline, which means an earlier access to slightly more accurate javelins (They probably also have more Spd, anyway). Against knights, Hammer is D-rank, Frederick can use it better. Miriel provides the marginal chip vs. Knights, but Frederick has Hammer, and can use it better.
Perhaps terrain, but you don't see much knights in desert chapters.