#2. Velasquez's limited experience as a professional wrestler
Cain Velasquez is a household name in the world of Mixed Martial Arts and sports in general. Owing to WWE's association with Fox and the latter's push for a more 'sports-oriented' product, the company has managed to rope in such an accomplished sporting personality.
However, it is important to note that his professional wrestling career began in March 2019 with Lucha Libre AAA Worldwide and he has featured in just one match. Although he did impress the critics in his first outing, for the casual WWE fans, he remains an unknown person with no information regarding his in-ring abilities as a wrestler.
Undoubtedly, professional wrestling has seen the arrival of several high-profile MMA fighters in the squared circle, such as Ronda Rousey, Shayna Baszler and Matt Riddle. However, expect Rousey, none of them have been thrust directly into the main event/title picture.
Hence, it seems highly improbable that WWE would put such high trust in an individual who has just started learning the art of professional wrestling, even if he is the legendary MMA fighter, Cain Velasquez.