The RDA strikes back?

[Human No More]

Any infiltration is extremely unlikely, the Na'vi would notice any impostor instantly because they would have literally no clue about anything. None of the marines cared at all about Pandora. Anyway, Avatars are 'insanely expensive', and any skxawng who appeared out of nowhere and who nobody knew (and sleeps like avatars do) and started trying to kill people would be dead very quickly (if they even survived the forest ). Also, the fact that they would still need to arrive at Pandora, and so would be broadcasting their arrival for months in advance even before arriving, plus the fact that it would be 13 years at a minimum before any specifically sent mission would arrive, longer if avatars were developed. Of course, not to mention the fact that the RDA are concerned with money, not random war.