Jeskai Control has countermagic (It'll Quench Ya!, Spell Pierce) and bounce-plus-burn like Jeskai Revelation, so Surrak, Elusive Hunter can't be countered and punishes their removal/bounce plan by drawing extra cards. Elesh Norn, Mother of Machines is a resilient 4/7 body that's hard for their burn-based removal (Combustion Technique, Firebending Lesson) to profitably answer and denies them value off Tablet of Discovery-style enters-the-battlefield triggers. Kiora, Behemoth Beckoner is a slow value engine that does little against a deck full of counters and bounce, so it's the natural cut. Sequence threats to play around Jeskai Revelation's bounce-plus-damage mode by not overextending into one big vulnerable permanent.