I agree with the OP, Jackson hasn't gotten a lot of pub. His signing has largely been lost among the Kiffin sound-bytes rolling across the ESPN ticker, stories of pecan logs and Vol hostesses along with the Bryce Brown saga, and Rod Wilkes jokes.
However, Jackson is the highest rated kid in our class at this point, and given that he's a coach's son and apparently very mature, I think he'll contribute early and often. My guess would be first or second CB off the bench early in the season, and if he plays well, possibly moving into a starting role by season's end.
FWIW, we could actually have an entire starting secondary full of 5* kids by season's end... Berry, Morely, Vinson and Jackson.