I'm going to stop discussing Magic now - I don't know it well enough, and it's utterly irrelevant anyway.
You missed my point on combat and uninterruptable effects. If no other effect can start until the currently triggered one finishes resolving, what happens when it allows an attack? If Gunner triggers and gives you an attack, Gunner isn't complete until that attack is complete. What happens to any other ability that might trigger during that attack?