Nah, they don't say anything useful. I remember talking to them multiples times when we were racing to have the first pop in sea, and none were saying anything that could be interpreted as a way to kill something/pop something.
I spent a few hour in front of the Star chart, Ecosystem chart and Elemental chart trying to figure a pattern for sea drop rate, but only ended up breaking something in my brain.
Sea suck, it's just good to make you paranoid.
[Edit]
Imagine the loot drama you will get with that strategy, when over 100 blm and Ninja will be fighting for Ninurta Sash and the rest.
Hopefully, someone will disband the alliance and everything will be lost, making the best drama thread ever created by mankind.