What we currently have returning (and will be adding) after this year is the following:
Reaves- Rivals ranking- 3 star (1st 2 years at WSU)
Doolittle- Rivals ranking- 3 star
Freeman- Rivals ranking- 4 star
Manek- Rivals ranking- 3 star
Polla- Rivals ranking- 3 star
Bieniemy- Rivals ranking- 4 star
Kuath (If he makes it to OU, don't see him on the current roster)- Rivals ranking- 3 star
Harmon (banking on him signing at this poing)- 4 star
So at this point OU would have 3 4 stars (per Rivals rankings) and 5 3 stars on the roster. That isn't gang busters but that also isn't a terrible overall team. Obviously stars don't always matter (Freeman is a 4 star on paper and hasn't done much to this point. But Reaves was a 3 star and looked at as one of if not the top transfer with more than 1 year to play this off season). Do they need to add more talent? Of course they do. But as of right this minute, it's not like they aren't returning any talent at all.