True but realize they are older and have fewer years of eligibility. Most JUCOs are Jrs - so only two years of PT remain. That same 4* rated 68, if you redshirt, then give him 2 more years to reach JR year eligibility might improve to a 74-84 ovr by the time he only has 2yrs of eligibility remaining.
Typical rule of thumb is if you need a starter/high rated player, check out the JUCOs. If you can afford to redshirt/build depth, usually is better to go after the non-JUCOs.