Eh, none of the NPCs really did much in the games, and it is not like we have a lot of canon with which to work, so you could make a case for adjustment. The game implies he used to fly with Fox and thus could probably keep up with him. He was also in command of the squadrons around Katina, and you did not already have a PS7 Cornerian pilot.
We have more info than you think. Bill and Fox went to the same academy together, that has to count for something.
If we use Fox from the Nintendo Power Comic universe he is hands down the best pilot. He was the only one able to navigate the black hole ( it really a worm hole, black holes lead only to death.) He also took on a armada by him self including the atomic core ship before fighting the ape for a third time.
I am well aware of how much we have, and it is not much compared to something like Star Wars. There are a few later things that imply Falco was a slightly better pilot than Fox.
Yeah, but he's most famous for his love of the barrel roll.
Eh, give it to Slippy then.
"Enemy shield analyzed!"