@I:
Look, it may well be that logia cannot use their power to go partial logia–you could be right--but we as of this moment do not know that for sure.
We can only work with what we have right now.
I can if anyone wants, though
Let's hear it, but I don't think this is the right place.
My best example is that Chopper can go full reindeer and is still a d/f user, so would still be a hammer–but he can also go into several partial shapes that are not fully human or reindeer
The thing is, Chopper's full reindeer form is one of his seven transformation. for any zoan, there usual appearance is one of their form, so they are still using their DF in that form.
We have also seen Ace light just his arm, or his top half, not his full body. We know that with enough practice they can control it to the point of not, in Ace's case, burning the hat he wove for little Oars.
Like Silverblade said, "to create fire" this is one of the abilities that logia users have. In ace's case he couldn't control his ability to create fire when making oars jr. hat, so ended up burning it. Practice helped him control his ability to create fire (not turning off his ability).
Ace's ability is confusing because of the fire, but if you look at others like kizaru, in this page..
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only his leg is light, yet Brook's attacks are passing through him which means his whole body is in logia state. People confuse Ace's ability because it's fire, so they think they need to see the fire to know he's using his DF.
Spoiler alert!!
! > We saw Luffy use gear 2 on just his arm recently as well. I don't see it as that much of a stretch that logias, with enough practice and training, could become some interim form, partial element and partial solid.
! I think this only applies to luffy, he's maximizing the use of his DF through the gears. And the properties of his DF isn't changing he can still stretch, he can't touch logia with only the gears, right?
Other DF users can work their abilities to the fullest, but can't change it's properties.
As for all the explanation, I know a guy who knows everything about DFs.