After Kinemon survived Onigashima, I have had a hard time accepting Guernica's death.
But, if you notice, Kinemon and Guernica "died" in the same way: Kaido slamming his Kanabo into their heads straight down.
Kinemon survived due to Law Devil Fruit BS, but, Guernica was a much stronger fighter, with access to Rokushiki techniques like Iron Body.
So?
I think Mr. Go CHOSE to "die", in order to escape the World Government.
I find it almost impossible there isn't SOME rogue faction within Cipher Pol. Even the Celestial Dragons had Harald, Shanks, Shuri, and Myosgard and Homing.
I think Mr. Go used the chaos of Onigashima to fake his death and then defect. To where?
Honestly... the Revs. Like, who else can actually protect a former CP agent, and MY GOSH, the Revs could use his info.
I believe... he's coming back.

