There is no possible way that the ESRB will change its rating. It has never changed a rating in the past, and it definitely won't do it to a game that has been out for a few years just because a handful of people ask them to. I personally think that Twilight Princess shouldn't be rated T, but its a justified T. It has some blood, stabbing, realistic-ish graphics, and its really dark. Obviously too scary for children that can't handle it. Plus, the ratings are a suggestion and its ultimately up to the parent to decide if its suitable.
That red stain on the gates in front of Kakariko..... I'm pretty sure that's blood.Where is the blood in Twilight Princess?
Whenever you hit something, it sparks. They don't bleed, that I've seen.