MS mistranslates the amount of people that Franky wants to be able to carry as 10,000. JB and VIZ get it right with 100,000, making it an even more clear overestimation. Also, JB says that Zoro picked up "Sunacchi" from the "geezers" (plural) in his village, which makes it sound like it's something he really says, while MS and VIZ have him say "old guy" (singular, as in, probably Kozaburo from Wano), and he explicitly states he's never said it himself before.
That makes a really,
really big difference here. From accommodating 4200 to 10,000, Franky has to approximately double the size of his fleet. For an army of 100,000 like the Marines at Marineford or Hody Jones's groupies, Franky needs to build a fleet 20 times the numbers they actually have.
100,000 Vs 30,000 from Kaido and Orochi, plus whatever Big Mom brought along for the Fire Festival, and the possibility that Kaido is hiding more troops in his other territories which I imagine are not left unprotected. The numbers are already dwarfing Marineford.
A note + thoughts from me: all three translations have Hitetsu state that, if Zoro turns Enma black, that'll raise its "rank". That doesn't strike me, though, as saying that that would move it from the "21 Excellent Grade" to the "12 Supreme Grade"; I feel like he'd need to say that turning Enma black would "raise its grade" to have that meaning. Plus, otherwise you'd think there wouldn't be a set number of Skillful/Excellent/Supreme Grade swords if turning a blade black changed it from one to another. I'm guessing that, even in the same Grade, there are some swords that are "better" or more prestigious/strong than others (and Enma seems to be one such), so they're even "ranked" compared to each other, and so if Zoro turns Enma black, it'll be an even more prized and special Excellent Grade sword than it already is.
Nice thoughts. When Oda leaves things vague and uncertain, it seems he wants to surprise his readers with a bang later down the line.
The way the narrative has been established, raising the rank of a blade but not raising its grade has no impact at all. Ranks within the same grade don't exist as far as we know. We can assume two blades of the same grade can still differ substantially in quality, but it has not been pointed out to the readers. We can also assume Hitetsu is being uncertain because not every black blade automatically raises the grade but only those from a truly future legendary swordsman, namely Zoro. Zoro being one of the handful of master swordsman in all of history to blacken his blades is not likely to result in a mere decorative gesture. For now, I strongly lean towards the possibility that Wado and Enma can achieve Supreme Grade by the end of the series.