When one day, you suddenly realize that retreating, forbearing, lying low, being humble, obedient, and keeping a low profile, and so on and so forth, all fail to yield the results you desire, then you must become tyrannical, ruthless, heartless, cold-blooded, and arrogant.
Yusuf Zuck was no longer willing to hide or remain low profile. The death of Aiden Wilkinson had greatly affected him and caused indelible harm in his heart.
Overnight, he decided to erupt in fury, to completely and utterly explode with it—all concerns about the elf race, the Jimmie Campbell Sect Master, the fear of someone discovering he was Bryson Campbell—were all cast aside.
To save the elf race, it wasn't necessary to infiltrate covertly; he could also resort to seizing by force.
As for becoming the Campbell Sect Master, he didn't need to ascend step by step; he could simply subdue with brute force.