Quote Originally Posted by Sentenal View Post
How is "healing any injury as long as he's not in contact with seastone" any different from a Logia?
Because Seastone+Darkness Fruit+Ocean << Seastone+Darkness Fruit+Ocean+Haki attacks+Elemental Weakness

It's at least two less weaknesses.

The tradeoff being that Macro seems to actually take damage, it just goes away. While Logia users usually just have things they aren't weak against pass through them.