It's because in high school, you can survive just off having one freaky athletic trait (elite speed, crazy strong, polished skills etc).
In college, the you're surrounded by freak athletes that often have 2 or more crazy traits. Deion was GOAT at corner so he's gonna be harder on that position than he might be on the backup NT. Cormani is trying to do what he did in H.S. but that shyt is not working against good/great/elite P5 receivers. You gotta lift, study and do all that boring shyt to be effective on the field.
Could also be that Cormani is doing "ok" but Prime wants him to step it up more.