Three Houses, One Captive

A man was forced into a vehicle by men holding what appeared to be handguns. Over the next eight days he was held in three different houses, kept in a closet at the first, blindfolded or covering his own eyes, and duct-taped when he was moved. His captors threatened him, at times with what looked like a gun, until police raided the houses and rescued him. The Accused was one of five adults charged. It was accepted that he played no part in, and did not know about, the original abduction, and that he did not physically help move the victim between houses, although he knew of the moves. Fingerprint, footprint and DNA evidence placed him in all three houses. He took part in the confinement at each one, helped buy a tarp and duct tape, and discussed a ransom with another captor in the victim's presence; the victim was told he would be killed if it was not paid. Is a person who joins after the abduction guilty of kidnapping, or only of unlawful confinement?