I understand what you're saying -- I just don't see how that goal would have been prevented if Coleman had started the play planted on the far post. He still would have been right there getting in Robles' way and having the ball deflect off of him when the header came in, wouldn't he?
I don't get the obsession with putting people on the posts when defending corners. I guess it comes down to whether you prefer zonal marking or man marking on a corner, but I've always felt that having defenders standing on a post just makes it more likely that you give up a scoring chance (since you've taken two defenders away from marking attackers and attacking the cross). If that chance comes somewhere near the post, I guess it works out, but I'd rather see the chance not given up in the first place. That assumes you actually have defenders capable of defending crosses, of course, but if they can't do that (like our defenders clearly can't) it doesn't matter where they start the play.