The combine tells you nothing that the interview won't tell you. If you do the combine, you still have to do the interview. There just aren't enough points for both. I'd rather do the group workout, and after that, get as many interviews in as possible.
And there aren't enough points to intereview all the players, either. However, it is possible to do the combine and group workout and then find all the top 18 year old prospects in the draft pool. You can't do that through interviews alone (or if you can, I haven't figured out how yet).
Sorry, RIP has it right here.
Run of the Mill Canadian Manager