Kaku's growth rate was higher than even Lucci before TS.
Care to elaborate?
I agree Kaku has better potential than the rest of the cp9 in strength. But not Lucci.
If you are going off of how Kaku mastered his DF so quickly, that's not gonna matter now. Cause, a DF, especially a normal Zoan, has a limit or Ceiling in terms of mastery. And Kaku achieving the mastery of the Giraffe DF quickly doesn't mean he has better potential than lucci. And once he has achieved that mastery, he's gonna plateau.
We also didn't see lucci get his df. He could also have gotten to that level of usage just as quickly for all we know. Even Kalifa did the same. Also have to take into consideration the plot.
And Lucci was famed as a very rare talent in Cipher pol history. Even vice admirals were praising him if i recall correctly.