Why do you like Kidd so much? Genuine question here.
Kidd has bad character design.
No good backstory.
He is not funny nor kind nor smart / scheming.
His DF sounds good on paper but the execution on One Piece is terrible.
His rail gun looks like washing machine.
His crew looks really shitty. Even Law's crew is more likeable with Bepo and friends.
If you want a rival figure, which is stronger, more dangerous, more cunning, smart and scheming, more relevant and has better character design, then why don't you pick Blackbeard instead?
I didnt liked Blackbeard since beginning, i hope it will improve later in the story.
About Kid, i will answer this honestly:
In my eyes, Kid is the pirate Luffy would be if he would have a real pirate adventure. Luffys Life is alot play and joking around, it seems a bit too easy sometimes, specially from side of Plotarmor, his family, his protector, his teacher.... you know what i mean.
Kid on the other hand, he was a nobody, (so far we know) born and raised in dirt, together with his best friend since then and everything he reached since then, was from his own bare hands. He was able to create a Crew strong enough to compete with the SN, even went out of it with the higgest bounty. He was able to compete in the New world, without Hax DF or training by the second strongest being in the verse. He went straight up for Yonkos, not even only survived, he also gathered what he wanted (on WCI).
For me, Kid shows a pirate with a strong friendship, which is able to gather whatever he wants, while not having any kind of Plotarmor, while sacrificing his arm, accepting his loses and grow. He is able to reach things, while everything around him is against him.
This is what makes him special in my eyes. He is a more serious Luffy without any kind of plotarmor or storyrelated easy-ways.