To Stoopkid

If Rigsby is RJ please answer the following points.

How can he be RJ, who was hiding in the farm behind the door + running away when Rigsby is in a car with Cho speeding towards the farm to rescue Jane.

How in the season 4 finale did RJ talk to Jane if it was Rigsby ? Rigsby is in handcuffs with the rest of the team being guarded by the FBI. And no the message was not recorded as RJ responded to what Jane said.