Yes, she can't kick while she's being held down, but can't see the three coordinating their attack and acting in concert such that she would not have kicked, scratched, biten, pulled their hair before they could subdue her..
If by some chance they did manage to subdue her without her doing what I mentioned, then they have to avoid leaving blood splatter/smearing evidence showing they were all there... as well as not leaving some real DNA (beyond low copy number DNA).
Just too many things had to go to perfectly for three people I cannot see working in harmony, and if they had been drinking, using pot, all the less the could work together....
Combine that with RG not implicating AK/RS when he was first captured, that alone has me believing that AK/RS were not involved.