While I could see us taking a slight step back I dont think 17 is reasonable. I cannot explain how bad Iowa was when KF took over.
All stats and rankings from
https://www.sports-reference.com
2018: 31.2 (44th of 130)
2017: 28.2 (66th of 130)
2016: 24.9 (95th of 128)
2015: 30.9 (53rd of 128)
2014: 28.2 (70th of 128)
2013: 26.3 (80th of 125)
2012: 19.3 (113th of 124)
2011: 27.5 (58th of 120)
2010: 28.9 (49thof 120)
2009: 23.2 (86th of 120)
2008: 30.3 (33rd of 120)
2007: 18.5 (111th of 120)
2006: 23.8 (58th of 119)
2005: 30.0 (38th of 119)
2004: 24.3 (70th of 120)
2003: 28.7 (41st of 117)
2002: 37.2 (7th of 117)
2001: 32.6 (23rd of 117)
2000: 16.9 (101st of 116)
1999: 14.7 (105th of 114)
Fwiw I think our defense will actually be better.