I don't know.. the photo of the decoy teams seems too fabricated. Normally decoy teams will be seperate out, not group together. E.g if one of 3 finalist teams is way ahead of another 2 teams, a decoy team will follow that particular team and the remaining teams will be with another set of decoy teams.
Maybe, just maybe, Jen & Keisha made final 3 and are the first team to arrive in Hawaii.. I also notice that they did not carry any bags. It could be possible that they just chuck away their back packs & continue with the race. I mean hey, it is for a million bucks. I know some of u will say where is the soundman if Keisha & Jen are in the final 3. If u look closely to the cameraman, there's already a microphone on the cam and the sound man is needed when teams are making audible dialouges.
Or like some of u said, they record all the decoys after the final mat. Could be another possibilities also. Now, nothing is certain for me. I mean it could go a lot of ways. Jamie & Cara are seen together with Margie & Luke. It could also be possible that one of the teams are a decoy to another.
We'll just wait and see.