Well, we really don't have to scale that much for Nolan. He's got a solid speed feat to his name: He fights Red Rush, and while Nolan is clearly slower than the speedster, he's still fast enough the catch the guy out of his blitz. That tracks along with his presentation: he specifically explains that Viltrumites are speedy, and Viltrumites display some enhanced speed on a number of occasions. They also forget about it for the good of the plot, but that's comics.
If Donald had a feat of catching a speedster out of a blitz, and that speed were backed up by presentation and narrative, then Donald would get that level of speed. That's not really what happens here though.