It really is about finals week. From Preview to Finals judges have made the decision which corps' are really in the hunt. Though this is not always the case as you pointed in 1996. However, by mid-late season history shows that on most years two corps' rise to the top. I'm not sure why, it just seems to work out that way. There are always those corps' who if they cleaned like crazy or make some drastic changes can get back in, but few rarely do. Some corps' may start slow, others fast, but with about three weeks to go there just always seems to be Two, maybe three who stand above the rest. If I had a dollar every year Steve R. said that it was a two horse race on the PBS telecast I'd be a moderately poor man, but you get my point.