Nice backstory.
A good Tankman once said "What's the point of all the action if we don't get any character development?" Just now, you rectified that very same problem, but good.
After Tankmen 2, it was easy enough to find the bonus scene. Be a little more creative on where you hide it. Put it on someone's dick or something. NOBODY will find it there.
9/10, 5 in the Portal.