That drawing had to be done while the door was down and the black light on. Do we really believe that someone sat around every couple of months waiting for the door to drop and the black light to come on for a few minutes at most, so they would be able to draw the diagram? Think about it. Whoever did that drawing had knowledge of the workings of the hatch. As well as the location of the other hatches, the fact that at least one is no longer funtional, and the details of what happened during the other food drops ect. ect. ect. Whoever drew that diagram is NOT just some guy who pushes the botton. They must be "in the loop" to borrow a line from Hurley.
As for "Henry" I think he did push the button. He didn't have much time to do anthing else. I'm not saying he didn't do anything else. I'm saying he didn't have much time. So if he got the doors to open it had to have been a control in the hatch or at the computer.

__________________
Hope is a very dangerous thing to lose. - Sayid

I do what my Rice Krispies tell me to. - Anonymous