Yeah, definitely mention that. I brought up that point after thinking of a job interview that I had while at Kellogg. I told my interviewer what I thought was a pretty good story, but afterwards, during a feedback session (I got dinged!), she said that the solution that I implemented sounded like an obvious one, and it didn't sound like I really had to fight to make it happen. I actually did have to work hard to convince people to implement the change, but I didn't realize that this was the kind of info she'd been looking for, so I left out those details.
So, when I see that kind of question now, I think about that. That's not the only thing they may be looking for in that essay question, but it's a compelling story to tell if you can.
Scott