I was re-reading Arlong Park arc and something striked me!! The last time I had checked that arc was back like… 2006? I wasn't really into ONE PIECE so I didn't buy the Graphic Novels, I just read it on SJ but now that I have read all the material something interesting came to my mind.
When reading Arlong Park arc IIRC Arlong said something along the lines of fishmen being evolved forms of humans, now that was just his theory and Nami said something like "I´m sick of your stupid theories!" but in a SBS Oda answered that Fishmen are actually mammals... So either fishmen are evolved fish that evolved into human or the other way around, it still intriged me.
Now, I haven't really seen Movie 10 but from what I have read so far it involves animals evolving in some way?? Do you think Oda might show us more interesting evolutions in the manga?
Also does anyone know what race Magellan is?? Since Oda has lots of wacky character designs it seems like humans in ONE PIECE are evolving into animals, instead of the other way around..
In example. the dude that fought Sanji in the Sea-Train looked like a Snail, Usopp and Kaku might have been failed attempts of men-evolving into a fishman saw fish (Because of the nose) and so on LOL.
I know this isn´t a theory but knowing Oda he might play with this a little bit, who knows maybe Dr. Vegapunk or Merman Island will explain more about this...
I know my post isn´t too well constructed, I am kinda lazy and just wanted to post my thaughts that evolution might play a strong part later in ONE PIECE.