Some people wants a confirmation and it's gonna be too long to be included in the next chapter so here it is.
Rei can use both Cyber Armors *and* the Kaiju's abilities without the Cyber Armor. The abilities comes with downsides.
Example: Using Bemstar's ability, Rei could fly in extreme speed but he can't absorb projectiles like Bemstar. But, using the Cyber Armor, he can fly, use the shield as boomerang like X, *and* absorb projectiles.
Another example: Using Zetton's ability, Rei could teleport and shoot energy bullets from his hands but he can't create energy shields. All of this, however, could be done using the Cyber Armor.
So summary: Cyber Armors grant more powers and defense, but the Physical Abilities are statistically stronger due to the fact they're not filtered by some kind of digital tech.
I hope nobody has any problems with this. If there is a problem or a lack of fit, I always accept suggestions and criticisms.