I still think Magellan is a Logia. If you look at the properties of the material they are made of, they are affected differently by kinetic energy. Energy such as fire, electricity and light are unaffected by kinetic force since it doesn't have any mass. Smoke is just particles in the air or polluted air. It's also unaffected by kinetic energy. Ice has solid mass and is affected. But it's fragile and too much kinetic force and it shatters. Sand has mass, but the grains of sand does not stick together and that could be the loophole I'm looking for as to why Crocodile don't feel and damage at all from a punch. Gravity isn't even worth explaining since it will be a wall of text.

Now Magellan is a thick liquid. Like cream or slime. Liquid absorbs kinetic energy. And the thicker it is the more it absorbs. Therefore i think that if you would punch Magellan in the gut, he might lose his breath for a moment, or wanna puke. But as for any real bodily damage he would be unaffected. And any damage would heal itself in a matter of seconds. Just like the twin jet pistol craters in his chest just fixed itself.