I actually have a
lot to say about this, which I've already discussed on Discord.
A few things regarding 5 separate speeds for Dowan: Base/Weapon Mastery/Booster/WM+Booster/Falcon Revolve
We don't actually have a sufficient speed calc for
Base Dowan, whether it be 1st, 2nd or 3rd Growth. I think using his base performance against Dae Bujin to scale him to his own
multiplied performance (Booster) is bogus, especially since Dowan's base stats are calculated in-verse by numbers. If they don't increase, it doesn't make sense for his base scaling to go up. Just look at the Mach 58 in Dowan's current page from stacked Booster multipliers.
Next is
Weapon Mastery. I think
this feat (Dowan throwing balls) should also not be used for his base, since WM is a very blatant buff to his speed. This is displayed in Chapter 53 where Dowan is surrounded by 2 gang members and says "I can't dodge both of them right now!", but overtakes the situation with a visibly massive boost via activating WM. Whether or not I agree with the calculation is a different question + I don't really have any idea why a
throwing feat is used for speed.
Not much to say about Booster itself, it's a 5x multiplier according to the creators. What I want to remark is related to it, though. For example: In the same fight as the initial Falcon Revolve, Dowan's WM deactivates due to losing his blade and instead he uses Booster, but the opponent is still able to see Dowan get behind him.
Furthermore, when
WM+Booster is used, the opponent still ended up reacting and put up a defensive stance to block (Chapter 102). This is explained by the opponent not actually having gone all out in their prior clash. Dowan was noted to only hold back on the last attack, to avoid being lethal, not the others. And this leads into what I want to say about
Falcon Revolve, which presents a full-powered version incapable of reacting to Dowan, proving WM < Booster < Falcon Revolve in terms of buffs.
(Hence, Booster shouldn't ever scale to Falcon Revolve.)
Besides, the Falcon Revolve feat shouldn't be using a full circumference anyway. We see that Dowan is still in the middle of
completing the circle during the panel, the entire off-screen left side wouldn't be included in the oval nor the calculation.