With an excellent-grade Companion Egg like Rebellious Knight, one would typically choose to hatch it unless they were already at the Epic stage and not have any need for a Legendary Companion Egg.
John had been running around with the Rebellious Knight Companion Egg without hatching it. This left Zhou Wen somewhat puzzled.
Hence, after obtaining Rebellious Knight, Zhou Wen carefully studied all of its attributes, including his Life Providence.
Then, Zhou Wen realized the problem. Although Rebellious Knight's Life Providence being Knight of Destiny didn't seem to be a problem, the blurb introducing it was very intriguing.
Knight of Destiny: Knight favored by destiny, the eternal protagonist.
Despite being a Companion Beast, he had a Life Providence of a protagonist. This clearly wasn't a good thing. At the very least, John definitely thought so. Otherwise, there was no reason for him not to hatch Rebellious Knight.