After listening to the little sister several times, I think she was actually misquoted by the press. I hear her say "the
man came in and
he took her away..." in this video:
That said, it is curious that the FBI agent said "people responsible". This was after they found the car. Perhaps they have evidence that shows someone else was there? Perhaps they have more than one man's fingerprints or DNA in the car? Or perhaps cigarettes were found near the car that were more than one brand and having distinct DNA? Or maybe they have something that indicates the suspect had to have gotten a ride out of the area. Someone might have helped the suspect
only by giving a ride or
only by ditching the car for them. If that hypothetical person does not come forward that person can be charged for aiding and abetting. JMO.