Well you can ask him what the standard practice is for encapsulation of rebar by gunite?
Or you can file that answer away should you have a problem in the future.
I have a meeting to finalize the tile at their main offices. I'm gonna bring it up one time to the designer and see what he has said since he's a straight shooter. From there I'm gonna discuss in person and see if anything changes. I'm pretty sure it will stay the same and I will be filing this for sure with screenshots for further reference if anything should arise.
Out of curiosity, what is the main concern if the clearance is not exactly 3" etc.