She has Color of Observation and she was assassinated. Decken is what I'm predicting.
It makes a ton of sense.
Assassinations are politically motivated. Decken as far as I can tell doesn't give a damn about Fishmen/human politics. He's like the joker. The only motivation for anything he's done thus far is to get to the princess. Also I believe that Oda is not that predictable when it comes to things like this. I'm sure he'll throw us for a loop and it will be the person we don't expect, or it could even be some new random person. Also thus far there has been no hint that he killed her. When he showed up at the palace I'm sure Neptune would have said "damn you Decken, you killed my wife".
I suspect it was either a radical fishman or a radical human (most likely ordered by tennryubito).
I didnt need King Neptume to tell me that she had color of observation the 3-4 page when she dodged the gunshot pretty much explained that. And lol at the kid with snot only coming through ONE nose
I think it was important. Otherwise people would waste time feuding over whether she has it or not.