WWE made a huge deal out of signing Jade Cargill last year. She was already a dominant figure in AEW, holding the TBS title for over 500 days. Since joining WWE, she's slowly been booked as a big-deal athlete, especially in tag matches alongside Belair, where she often received the hot tag and wiped out the opposition.
Compare that to Tiffany Stratton. While Stratton’s push has been steady, her character hasn't clicked on the same level. The WrestleMania 41 promos with Charlotte Flair didn’t land well. The Queen of the Ring momentum feels forced at this point. Meanwhile, Cargill has star presence, mic skills, and real credibility.
WWE sees long-term potential in Jade. She’s ready. And SummerSlam is the right time to crown her.