By being lethal genius he can use his leg as a sword around to cut ppl
Now go find the other numerous other instances where Kaku uses his legs, neck and nose instead. KAKU IS NOT A PURE SWORDSMAN THUS HIS DORIKI DOESNT CHANGE 😁
So Base Jyabura is nothing special and swordless Kaku is better than him while 4 sword style Kaku >>> Swordless Kaku
Base Lucci couldn't do anything to G2 Luffy and had to enter Hybrid.
We can imply the same would be for Jabura. Their base forms are only there to fight fodder basically.