It's still an awakened devil fruit, a concept that exists in the story. You can't explain Diable Jambe and Asura without headcanon.
BULLSHIT. Diablo janbe is the equivalent of the 6 powers in terms of vaguenes. The same way sanjis legs turn a blaze is how luccis long ranged shigan shots burn when he uses it in hybrid form.
Luffys entire fruit was REWRITTEN with zero build up to it. Its was odas way of literally explain how :
.luffy is so durable
Can recover fast
Can level up fast
Oda rewrote it that all of luffys growth was predicated on the fact that he has a mytical zoan fruit which are none to affect a users body passively even when they are in base.
That was ASS writing and the biggest undeserved powerup in this story