Hoodie,
If it had been a gyro, there'd be no need for a tail rotor.
Basically true. But the flight path could have been relatively benign, which would allow the craft to have a high inertial rotor. This inertia could used for a no-roll landing, and in this situation yaw control would be desirable.
When the stealth deed is done, helicopters come in, do a pickup, and get the hell out of there. A planned destruction of the craft could have been timed to go off after the Seals had departed.
Again
Dave