Shiki and Silver Axe are rivals, Ray and Gaban are rivals. Basically King and Queen of the Rox pirates.
Shiki is tighly connect to Roger interms of rivalries and battles
I see no logic how Ray fights Shiki much less took him out.
When someone have big fight in the past let alone beats one another, there is always a grudge or some hint of past rivalries/past confrontation .
There's Zero evidence for Shiki and Ray
There's alot other powerful and notorious pirate from Rocks crew that Oda could waste them for Ray and Gaban hype at GV
WB, Shiki, Kaido, Bigmom are for Roger hype as per the story.