Pass Rush abilities

Hi guys

I need a little help from u. I run 335 cub on defense , with 2 linebackers (with high zone stat) and 3 linemen (Garret, gravedigger and strahan). Now im asking. Does Interior Threat work on all 3 Linemen? Or just on my DT (Gravedigger)? Cause i have it on Gravedigger and Garrett, but on this lasto one it never lights up. Should i replace it with DON on Garrett?

To clearify my line is: OLinebacker, Garret(RE), Gravedigger(DT), Strahan(LE), OLinebacker.

Thanks

It only says the "interior of the d line" so if you have 3 men down, I would assume just the DT gets it. 

I would ASSUME it works on anything in from the ends but I havent used it.