@Zik:
You have to be fully submerged in water for the ill effects of being a DF user to kick in so San Juan can still be a DF user.
Luffy's feet along with Smoker were in water when they locked in that jail in Croc's underground pad as it was filling with water and they didn't become weak.
Seems to me in that scene San Juan was just complaining about having to walk from ID to Marineford.
The only reason DF users sink is because the cannot move any part of their body that makes contact with sea water. Are you saying that DF users would not sink if they somehow managed to keep their head and arms above water? Alright, be sure to let the strawhats know about that to counteract them constantly sinking.
Yeah… okay so Wolf walked from ID to marineford, this makes perfect sense. Are you implying that he walked the sea floor? or are you implying that he swam across the ocean?
If he's swimming in the fucking ocean he does not have a DF.
Seriously… WOLF DOES NOT FUCKING HAVE A DF. Oh, I forgot it's Oda, so anything can happen... right? morons.