The fruit could have some special property, like the ability to transfer memories or some shit from the previous user to the next. And maybe some of the past users are dangerous people like Joy Boy. I don't think Roger had it though. From what we have seen he was a simple hakiman.
Not likely, Lucci was said to be the strongest member in CP-9 history. Even though WhosWho ate the Sabertooth devil fruit, they both have Carnivorous Zoans. WhosWho could be slightly more durable, but Lucci is definitely more powerful, he probably learned Haki in the timeskip and joined the ranks of CP-0.
I still dont know why Zoro fans compare Sanji vs Zoro in this chapter even Zoro isnot present in this chapter :))).
Every single chapter that mentions Sanji, we can see Zoro fanboiz in there :))).
why Zoro fanboiz not mention about WW or Queen's Hybrid ????