I don't have gyros in all of my jets. Here is my list:

BVM Ultra Bandit - igyro
BVM Rafale - Cortex
BVM F86 - Cortex
BVM F80 - no gyro
ACR F-89 - Cortex
Classic Lightning - No gyro
Skymaster F4 - no gyro

Once the A4 is done it will have a gyro. I really have no reason to put one in the Lightning or the F4 as they fly fine without them and I don't compet with those. The UB came with one.