Was Vance Joseph a good defensive back coach?

Let’s evaluate how well Vance Joseph coached before he became the head coach of the Denver Broncos.

Through three games this season our once-vaunted secondary has fallen far. We are currently 25th in the league in completion % allowed, 18th in TD% (% of throws that result in a TD), tied for 14th in interception % (% of throws that we intercept) and 23rd in QB Rating allowed (we are allowing a QB rating of 102.2).

While I know that Vance Joseph is not the defensive coordinator or the defensive backs coach, the question was raised in the snap count post as to whether or not Vance Joseph was a good DB coach in the NFL. So I went looking for data to determine an answer to this question. I looked at league rank in completion % allowed, passing TDs allowed, passes intercepted and QB rating allowed for all of the defensive backfields that he coached (directly or indirectly) during his time as an NFL assistant. Below is the data - with league rank in the four right-hand columns.

Year	Employer	Role	Comp%	Passing TDs	INTs	QB Rating
2005	San Francisco 49ers	Asst. Defensive Backs	31	31	18	30
2006	San Francisco 49ers	Defensive Backs	29	29	23	28
2007	San Francisco 49ers	Defensive Backs	27	21	29	28
2008	San Francisco 49ers	Defensive Backs	24	22	23	19
2009	San Francisco 49ers	Defensive Backs	16	3	12	8
2010	San Francisco 49ers	Defensive Backs	30	23	18	26
2011	Houston Texans	Defensive Backs	1	6	15	2
2012	Houston Texans	Defensive Backs	1	26	15	10
2013	Houston Texans	Defensive Backs	14	23	32	23
2014	Cincinnati Bengals	Defensive Backs	9	3	3	3
2015	Cincinnati Bengals	Defensive Backs	20	2	3	5
2016	Miami Dolphins	Defensive Coordinator	13	26	10	17

So his defensive backfield stunk while he was the DB coach in San Francisco. He had an elite unit for his first two seasons in Houston that faded badly in 2013. He defensive backfield in Cincy was one of the best units in the league for his two seasons there. When he ascended to the defensive coordinator role with the Dolphins for the 2016 season, his defensive backfield was average.

My conclusion from looking at the data is that Vance Joseph can be a very effective DB coach. If we were to apply this same method to Joe Woods, I’m guessing that we wood get a similar result set (but I did not pull those numbers together) - I might be talked into doing that in the comments section though.

All data is from www.NFL.com and/or www.pro-football-reference.com.

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