All because of a dumb power system that hasn't been used in 15+ years
Kaku has always been superior to Jabra, Kaku's attacks affected the whole building and Jabra only a floor of the tower.. It's very simple..
With the discrepancy between 4000 Doriki and 2000 Doriki, it makes a lot of sense having one character in the range of 3000 Doriki.. Especially if said character got a power boost right after the measurement.. It's hard to think logically, that's why most Zoro fans think he has AdCoC when he doesn't..