Nah...he can redshirt next year (2019), be understudy for Riddle/Riley in ‘20, and start for 3 years, from ‘21-‘23, when Riley graduates and Riddle leaves early for the NFL after the 2020 season.
NCAA MANUAL
20.10.1 ...intercollegiate athletics...competition in amateur athletics…
20.10.1.2 …maintaining a line of demarcation between student-athletes who participate in the Collegiate Model and athletes competing in the professional model
20.10.1 ...intercollegiate athletics...competition in amateur athletics…
20.10.1.2 …maintaining a line of demarcation between student-athletes who participate in the Collegiate Model and athletes competing in the professional model