I like Rochell as a prospect, as a player right now, there's no comparison between him and what Hill was for the Rams last year. Hill was a vet who could play outside, slot and star seamlessly. Rochell just doesn't have the experience. I think the best you hope for with him this season is a guy who can play outside corner and, hopefully, some man coverage.
The loss of Hill and Johnson is something that I think is consistently underplayed on here when it comes to assessing the job Morris is doing... especially without capable replacements. Long was supposed to be the guy coming in for Hill and Burgess was expected to help at safety in coverage situations (neither he or Rapp were expected, imo, to be the "one guy" replacing Johnson because neither is a complete player).