All the additional free orbs I obtained in the hopes of pulling Kaden these past few days didn't get me Kaden, so I whaled for 20 orbs. Once those those 20 orbs went by, I pulled another Kaden!
Even better, this Kaden had a nature of +Atk -HP this time. Now that is an absolutely PERFECT Asset!
I then merged my old Kaden with the new one, and soon after, I finished his build:
I don't have any other usable beasts right now, so I made this build for Kaden so that he could fit into my Horse Emblem team as the green unit. He also makes a decent partner for my Hrid, covering the latter's weakness to blue units while also giving him Goad Cavalry buffs.
Perhaps once I get access to some other useful skills, Kaden will have another build more optimized for mixed teams.