Sentai Teams with Just Randomly Picked Rangers

Now for the just randomly picked rangers:

Flashmen- They were just kidnapped by Mess and were later rescued by the Flash people.  Totally random.  Thanks for pointing out ThatChick.

Livemen- Apparently out of random as they were the survivors who did the project themselves.

Jetmen- Unlike Ryu Tendo, the other four were accidentally bombarded by the birdonic waves.  From the random four, only Gai Yuuki seemed to be destined for it.

Hurricangers- They were the last three available so they were selected.