It is the case so far but it isn’t confirmed
@Roo
Before WCI it wasnt confirmed that logias HAD TO BE natural elements
In fact WCI technically didnt confirm it
no part of the manga ever explained that Logias must be natural elements, so Oda made katakuri a logia… Then someone told him that that doesnt follow the rules of logias and he changed him to a paramecia
but thats the thing, this rule doesnt exist in the manga or sbs or vivre card or anything. Its just a things that kept happening and peoole assumed it was true. To the point that Oda himself broke the “rule” because it wasnt actually a rule anywhere. Oda changed Katakuri to a paramecia because of this “rule” but the manga still doesnt have any stipulation anywhere that “logias must be natural elements”
So thats what im going off of for the Mythical fruits.
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Caribou's mud isn't an element
@Roo It is. Have you never watched Captain Planet? Mud is part of the Earth element
Same way Snow is part of the Ice element and it ends up as two different devil fruits