As others have said, the parental part of FAFSA EFC is halved. If the numbers are low enough, you could qualify for some PELL grant money. Also, each kid may qualify for some subsidized Direct loans. That is all that is guaranteed by the pure numbers. At certain thresholds, a student is eligible for federal aid in those forms.
But maximum PELL is about $6345 for this current school. A student has to have a ZERO EFC to get that full amount and as the EFC gets into the $6k range, it starts to go away entirely. Maximum subsidized Direct Loan is $5500 for junior year status students.
Any other other is dependent upon the state and the school itself. I don’t think CU guarantees to meet full need. They often simply gap. As suggested, you can run their NPCs and for other schools to get an idea what your students may get. I have seen a lot of cases where a student just gets more subsidized loans, or even nothing. Having need has no guarantee of it being met.
There is also the possibility that a school does not fund upperclassmen as well as they do incoming freshmen. School need to recruit; upperclassmen more likely to stick it out and remain at the school whereas high school seniors can compare offers when they apply to a number of schools