I can see why you like Long. To be honest it was between Long and Rapp for me. I think the way they use Rapp is in sets like big nickle. You get 3 safeties out there with Weddle in the box, and Rapp acting as the big nickle. Plus Rapp is a big safety (pun) net. If JJ III or Weddle go down, there's not a huge dropoff. Then you add the football smarts....Rapp might eventually be the guy making adjustments prior to the snap.
Long seems to be such an upgrade as depth with the ability to replace replace Talib or Peters in an injury situation with possibly minor dropoff. Long could end up elite and a complete steal with a year of seasoning. Is Long as versatile? I guess he can play a traditional nickle role? How much does Wade want to play a traditional nickle as opposed to big nickle?
In the end I look at Rapp and Long as 1a and 1b. I'm probably biased because I was a safety.