You know his initial invitation to join the Discovery crew. I mean she did refuse when she thought they were working on a biological spore weapon (which as she pointed out was against Federation Law) but he convinced her with that quick trip around the quadrant. But what if even after that she had still refused to join, deciding to just quietly serve her time instead. Seeing as she’s the lynchpin to his ultimate goal of taking over the Empire, what do you think he’d have done?