I just looked at the 5a regional at Emporia. only 4 classes had a full 8 competitor bracket.
several of the 123 and 4a brackets are not full, but they certainly have more than 8 in them, and ] I found none with only 6, as in the case of 103 at emporia. since i didn't look at any of the other 5 or 6 a brackets I can't say if this is a trend, but it seems to me that in a typical 4a or 123a regional, in order for the numerical odds of survival to be the same, you would have to have 40 percent or so of the teams participating open at that weight. Most of the 321 and 41 brackets that I saw had 11 or 12 in them. Based only on the Emporia brackets, it looks like they averaged around 7 wrestlers, while most smaller school brackets average about 11. that is about 50% more difficult numerically.