"False ... more accurate"
Saint pro has a rim width equal to the saint, the XXX has a tremendously wide rim for a speed 7... I mean I get that these fly "slower" (what does that really mean) thanks to the blunt rims, but man, nothing about speed ratings is objective. Throw these with a rig and see how fast they lose speed, then we can talk about facts.
I'm just giving my opinions. There probably are no facts that can be called upon about disc speeds, so if we stick to them we will end up saying nothing.
I realize that a XXX has a rim that is bigger than what you expect a speed 7 disc to have. It flies shorter than a speed 8 or 9 disc though. It flies shorter than pretty much every speed 7 disc. Compare it to a Firebird. In my experience, it is shorter by a fair bit. One could try to attribute this to lots of overstability, but my Firebirds fade as much as my XXXs. The XXX is just shorter; that is my experience.
I don't know of any formula that disc manufacturers use to determine speed ratings. I don't know if an objective definition for this even exists. So, I throw them and categorize them myself.
Lat65 and DD just recalibrated their speed ratings on lots of discs, and I happen to think that most of these new ratings match my opinions better than before.
If you think a XXX should be categorized as faster based on whatever formula it is that you have made up for speed, fine. I don't care. I have my own ideas, and these manufacturers just reinforced my views. That is what I am saying.