I watched a bunch of gameplay on stream, etc and then tried him myself with that "inside threat" AKA factor on....On all the gameplay I watched and then when I used him myself, I just didn't see it making a difference. Honestly, he played the same when it wasn't lit up.
I think on some of these X factors they maybe tweak the card to increase by like 5% or something very small. Freight train too....yeah, you break 1 tackle but you get slowed down and then that's it. Not saying it's a bad thing but if you are going to spend training, use AP, use up an X factor slot, you kind of expect them to do what they say they will.