Please dont take this the wrong way but i need ask . Why wasnt a title at 2a level achieved with this staff , im sure some will turn this into a controversial question but i believe its a fair one to ask so please enlighten me ?
Enrollment & better competition. They were a small 2A school, combined with the fact that the teams at the top of 2A are typically better than the teams at the top of 1A. They were still in the same district when they were 1A and 2A, so their regular season numbers have remained constant over the years with them being a top 2 team in the district each year, but the playoff wins and losses are where the differences lie. Casto and crew have a fantastic coaching staff, hardworking & coachable kids, combined with a supportive community, and I enjoy seeing them beat up on the bigger schools more times than not when they play, but as the playoff records show, it was harder for them to win in the playoffs in 2A than it is in 1A.
As for why they've been so successful in their return to 1A, you could use the same factors, enrollment and competition. They are one of the bigger 1A schools and the competition isn't quite as good in 1A on a consistent basis. I think lower enrollment has more of a impact in the lower classes than the upper, but I don't have any data to back that up, just my opinion.