Again, use logic. He does that cause water ISN'T a weakness.
Once again. Your basing that off nothing. Oda never implied that.
Mihawk is no jackass, if he ate a fruit he knows he'd be screwed if he hit water, he wouldn't be sailing along on a boat like his if he ate a devil fruit.
How do you know? He could be, and probably is. Oda may be showing us that he likes to live "on the edge".
Mihawk is just a great swordsmen, accept that. Don't you know how strong Mihawk's honor is? He would not hold himself up so high if he was secretly hiding devil fruit abilities.
How do you know? He might.
Mi Hawk might have not even had the need to use it yet.
He's a swordsmen, S-W-O-R-D-S-M-E-N. He doesn't need a devil fruit.
Please tell me where Oda said this. Please.
However I do recall one of his characters saying that he had one and Mi Hawk smiling back at him. Perhaps Kriege saw it while his fleet was being destroyed back on the Grand Line.