It would be surprising if they are decoys. I don't know that TARPH would care to do that
From what we know, it would appear Matt & Phoebe make it to the final Leg based on that Finish Line shot.
So, using just the Finish Line spoiler:
6th - Jet & Yna
5th - Vince & Ed
4th - AJ & Jody
Final 3 - Roch & Eji, Kelvin & JP, Matt & Phoebe
But without that Finish Line spoiler:
6th - Jet & Yna - no sightings in Iloilo
5th - Vince & Ed or Kelvin & JP - trailing in Iloilo
Final 4 - Roch & Eji, AJ & Jody, Matt & Phoebe + Kelvin & JP/Vince & Ed
It's funny that TV5 is showing the 'Finish Line' shot again at their commercials, the "Happy Primetime Weekdays" thing, but I'm trying to find the video online but it isn't there.
Jet & Yna were positioned at the back so does it mean they're eliminated early or something. We don't know. Maybe after tonight's episode, we'll have a clear view about who's going home next.
I don't think M/P bickering in the taxi is their downfall.