User blog comment:Dinosel/Chapter 871: Big Mom used thunderbolt... It was super effective!/@comment-26058050-20170709024856

Just saying, CP0 is an intelligence group, what better way to gain intelligence than to infiltrate and rise up to the ranks, and at the same time, influence the actions of the underworld to suit the WG? It's really not all that different to what CP9 did at Water 7