Ahh, I see.
I mean like..
Let's take Carl 3C (slide w/ knockdown) as an example.
If you get hit while standing, you're knocked down, and Carl can OTG you for combo.
This is very basic Carl set up.
But let's say for some reason 3C hit you and you were falling/jumping/anything but standing, you'll be able to tech the moment you hit the floor.
This is what I meant by some OTG not working if you're hit out of the air.
Button input on wake up, I guess might not make a difference, but I'm speaking for teching in general.
It's best to alternate A&B to tech, rather than B&C for example.
If you're using B&C to tech, it's possible to get thrown, and have it be untechable (throw reject miss) because you're using the buttons that throw for tech.
If you tech, and the system reads your teching inputs as throw input as well, as soon as you're thrown, you won't be able to tech it.
A&B is just safer in general.