A couple things:
First of all, you'd obviously give him some major league run before offering such a deal. Wait until he proves himself at a high level. That mitigates some of the risk right there.
Second, not all top 5 prospects are created equal. Guys like Crawford, Russell, and Rosario were shortstops who were ranked highly due to their elite gloves at a premium defensive position and who showed promising tools with the bat at a time when the average offensive production for shortstops was severely depressed across baseball. They didn't necessarily have the same minor league production with the bat as some of these other guys, but were ranked highly due to the floor provided by the glove combined with the upside to hit at a high level for a shortstop. Some, like Crawford, eventually realized their offensive potential, while others, like Rosario and Russell, never did. Chourio is not really comparable to them, however, as his offensive production in the minors pretty clearly outpaces theirs. Also, some of these other guys, like Swanson, Bryant, Ackley, Benintendi were drafted out of college. They tend to have a safer floor, but not as high a ceiling. While Ackley was a pure "bust", each of Swanson, Bryant, and Benintendi have established themselves in the majors and experienced their share of success, yet have fallen short of superstar status, which is to be expected from college picks with limited ceilings. Chourio wouldn't even be draft eligible out of college until 2025, so again, not really comparable.
If you want to compare Chourio to previous top 5 prospects, he'd go into a tier with Julio Rodriguez, Tatis Jr., Acuna, Vlad Jr, Trout, Profar, Harper, etc. These are guys who all reached full-season ball at 18 years of age and proceeded to light it up with the bat, as Chourio did last year when he was the MVP of the Carolina League with a 160 wRC+ and .324/.373/.600 slash line. He then made it to AA, which only Tatis and Harper did. This is by far the tier with the best track record, as only Profar failed to become a superstar, and that was largely a result of injuries early in his career. Interestingly, Chourio's career minor league OPS of .837 is almost identical to Acuna's (.841)....
As for Chourio's numbers in AA this year, he had a slower first half due to the pre-tacked ball experiment in the Southern League which severely affected the spin and movement of pitches and led to a lot more weak contact and swing and miss. Meanwhile, Jackson Holliday did not have to deal with this as he played in a different league that used the regular ball. Once the ball went back to normal in the second half, Chourio essentially repeated his dominance from last year with a slash line of .323/.380/.544. This actually was superior to Jackson Holliday's second half slash line of .313/.412/.470.
So, while Chourio's not a surefire superstar (no prospect is), his type of profile is historically as close as it gets...Which is why I'm personally eager to lock him up sooner than later.