Actually, the kid couldn’t run progressions at the clock speed required. Nobody has a lot of time in the pocket. You’re dealing with 3-5 seconds. You need to be (1) identifying the D coverage immediately (sometimes masked only discovered after the snap), (2) going through your progressions in the first seconds to find your primary and make a decision to throw to where the receiver will be or check off to 2 or 3, all ideally in as close to parallel as humanly possible. The QB job is as much upstairs as an arm.
The super athletic RPO guys are great for compensating for slow processors. Just read your primary and tuck and go if you don’t know what to do next. The great RPO guys to it all (like a Mahomes).
ZT is not an RPO QB. He is too slow. ZT is not a pocket passer that can process fast. ZT has a good arm, but widely inaccurate in short to medium routes. He is a QB 3 all day long unless the other guys suck worse.