I'd say Shanks, Sengoku, and SW Ace are next on the list.
Good points! On Sengoku, I like to think of these things as, "Does this character achieve their purpose?" Post his original buff, Sengoku absolutely does, he enhances low-cost characters and allows speed-clears. So the only way I'd see to buff him would be the usual HP buff, since everything else still "works." If anything, his biggest issue is his lack of solid orb control, since such abilities tend to be on higher-cost characters (this is why Breed is so vital).
As for Ace, Shooters need help, but I expect them to address that with an upcoming new Legend as opposed to reworking Ace. They could do both, though!
But I do agree that "Make this character fit the current meta" is a better design goal for 6+'s. I don't know that Bandai is really doing that, though. WB kind of fits my original question (the lack of ATK boost at normal health is a detriment to achieving his purpose). Sabo's basically a straight upgrade. Rayleigh was kind of repurposed to support G4. Usopp feels like they had two ideas for his legend and decided to use both. Boa's special is all over the place, along with an upgrade to the second-worst captain ability among legends.
Lucci is the first 6+ to straight up increase max damage potential, though, which is interesting.
what i noticed it's that legend books seem to make a bigger impact hitting the ground,creating a kind of white flash under them and around them when they hit the ground..it's barely noticeable but in the last 2 days i've been able to predict what books were fuji books looking at that ,albeit technically the number of tries is still small..let's say that i did around 8 60 stamina tries and got the 2 times fuji books dropped right
i'll keep try looking for them to see if i got that right or it was just luck
It's weird, if they're going through that much trouble they may as well just put legend books into the rainbow chests.