I think you can reasonably draw two conclusions from the data.
1. 5A is better (only slightly) top to bottom than 4A....but isn't that expected?
2. Collectively, the top 10 teams in 4A are just as good as the top 10 teams in 5A.
I think we can all agree that if the largest 32 schools stayed 6A and the smallest 32 schools went 1A, 5A would be much stronger than it currently is.