The crack did not originate in the middle of the foot, it started at the bottom and grew upwards. It was pulled bigger in that middle area due to leverage and weakness. It started from the bottom of the hoof invading between the outer wall and waterline of the wall. It was not in the whiteline at all but the outer wall. It migrated with poor trims under the shoes and no treatment till it fissured open over time and with increasing infection, weakness and leverage of a too long toe. When the horse was reshod, the farrier tried to get the toe back by dubbing some of the toe off of the bottoms back into the good wall making it appear to not be present at the bottom. It was indeed present at the bottom until rasped away back into good wall.
Does this clarify enough? Its difficult to explain online without visual aids lol... It was a long term crack that progressed over time.