[goodguy]

Region 15 has 6 Sweet 16 wins in the past 6 years
Region 16 has 7 Sweet 16 wins in the past 6 year

For comparison the 7th Region has 13 wins and the 11th region has 13 wins over this same time period.

Of the 6 wins, 4 of those were in 2010. That means in the other 5 years the 15th only has 2 wins, not too strong in my books.