To be fair, we know that Kid wounded a SC sometime during the timeskip, but that his reputation was destroyed due to misinformation that Big Mom decided to spread to save face and thus may actually be stronger now than his bounty suggest
I always perceived Kid as Luffy's alter-ego, but with less luck than him due to not being the MC. He is almost as reckless as Luffy(Luffy more tho, but him being more evil). Luffy got the chance to train during the timeskip before attacking the new world because Rayleigh realized with how reckless Luffy was, he might have decided to attack the yonko right away and get killed(plot would have saved him anyway).
On the other hand, Kid had to experience hell by confronting the yonkos without training and thus lost his arms and got severe injuries, but i can see Oda using this fact as well to say that through this experience, Kid became even stronger considering it was already mentioned in a flashback that haki blooms in extreme situations.
And Kid was the one Oda had back in his mind to play an important role since the creation of SNs in Sabaody, important role which might play if he took down a named figure of the past(Yonko)
The editors added this for a reason