Missouri was mixed in the Big 12 under Pinkel, some very good years, some mediocrity:
Gary Pinkel (Big 12) (2001–2011)
2001 Pinkel 4–7 3–5
2002 Pinkel 5–7 2–6
2003 Pinkel 8–5 4–4 L Independence
2004 Pinkel 5–6 3–5
2005 Pinkel 7–5 4–4 W Independence
2006 Pinkel 8–5 4–4 L Sun
2007 Pinkel 12–2 7–1 W Cotton 5 4
2008 Pinkel 10–4 5–3 W Alamo 16 19
2009 Pinkel 8–5 4–4 L Texas
2010 Pinkel 10–3 6–2 L Insight 18 18
2011 Pinkel 8–5 5–4 W Independence
Gary Pinkel (SEC) (2012–present)
2012 Pinkel 5–7 2–6
2013 Pinkel 12-2 7-1 1st (East) W Cotton 5 5
2014 Pinkel 11-3 7-1 1st (East) W Citrus 11 14
Texas A&M and Missouri were pretty bad in the big 12. They look pretty comfy there
Texas Am hasn't had a good coach in almost 20 years. Sumlin has them respectable. I don't know much about Mizzou.
Missouri was very good in big12