Kylo mods

Nobod likes tenacity mods, but wouldnt he really benefit from resisting stun, ability block, buff immunity, heal immunity etc?

Hes one of the hardest characters to shut down and the main way of dealing with him is debuffing him. So why not tenacity? Does it not give enough resist chance?

I know i come up against plenty of rex teams and rex is always stuffed with tenacity mods. Its almost impossible for me to ability block rex.