All that planning. Simulation after simulation. Mock draft after mock draft. Hours, days and weeks trying to figure out what will happen with the four picks in front of you to determine who might be available at No. 5. And then, doing it all again for pick No. 10.  So much effort and angst. Will he be there? He will never drop to us. What might [fill in the name of a team] do, will someone trade out, how will our draft board rankings hold up when we are on the clock? The Giants went through all of it. Of course they did. That is the job of the general manager and that is how Joe Schoen spent so much of his time leading up to this past Thursday night. “I think Joe probably ran about a zillion mocks — no, maybe that’s a slight exaggeration,’’ head coach John Harbaugh said. “A zillion seems like a high number, but maybe it was a couple million.’’ Schoen smiled. “Close,’’ he said.…