As long as you also believe Xebec > Imu
Shiki is weaker than kaidou and gaban too, EOS sanji too.
Ten years after God Valley, Kaidou was becoming the embodiment/definition of strength in the world. He became known as the strongest living creature, and in one-on-one matches, always bet on him. According to King, "just stay the strongest there is" This portrayal alone overshadows any portrayal Shiki and Gaban have. Gaban was afraid of Kaidou.
Meanwhile, Shiki and Gaban are not known as the reference of maximum strength in the world, Kaidou was and in a period when the two were at their respective peaks, so it is not difficult to connect the wires man.