Here is a comparison of offensive ranks from the various play callers during Jason Garrett's tenure, and Mike McCarthy's time in Green Bay over roughly the same time period 13 years with Garrett as OC/HC - Average Rank = 10th Jason Garrett - Play Caller 6 years - average rank = 7th 2007 - 3rd 2008 - 13th 2009 - 2nd 2010 - 7th 2011 - 11th 2012 - 12th Bill Callahan - Play Caller - 1 year - rank = 16th 2013 - 16th Scott Linehan - Play Caller - 5 years - average rank = 14th 2014 - 7th 2015 - 22nd 2016 - 5th 2017 - 14th 2018 - 22nd Kellen Moore - Play Caller - 1 year - rank = 1st 2019 - 1st Mike McCarthy as HC - Average Rank = 10th Mike McCarthy - Play Caller - 13 years HC Green Bay Packers 2006-2018 2006 - 9th 2007 - 2nd 2008 - 8th 2009 - 6th 2010 - 9th 2011 - 3rd 2012 - 13th 2013 - 3rd 2014 - 6th 2015 - 23rd 2016 - 8th 2017 - 26th 2018 - 12th A few comments Mike McCarthy had a pretty awesome run with 6 straight top 10 offenses from 2006-2011, and 8 of 9 years from 2006-2014. The Packers average offensive rank in these 9 seasons was between the 6th and 7th best offense on a per year basis. It is arguable that over that extended time period, the Packers enjoyed the single best offense in the NFL, and were the most consistently good offense Mike McCarthy had a clear drop off after the 2014 season. The Packers average offensive ranking in his final 4 years in Green Bay was a dismal 17th. Maybe Aaron Rodgers had a legitimate complaint about the staleness of his offense at the end of his time in Green Bay. Of the Cowboys play callers over the 13 years that Jason Garrett was OC or HC, Kellen Moore was the best, but his small sample size of only 1 year means it's too early to judge. But it is clear why Mike McCarthy wants to keep him around. Between McCarthy and Moore, it is debatable who will be the better play caller, but the odds are pretty good the mixture of McCarthy's experience with Moore's innovation will be good for the Cowboys Jason Garrett was a pretty good play caller in his own right, with an average ranking of 7th in the NFL over the 6 years he called plays. For those who are salivating about him running the Giants offense, a word of caution seems appropriate - be careful what you wish for. Garrett will be a big improvement over the last 4 years, when the Giants average ranking was 22nd in the NFL. The years of Bill Callahan and Scott Linehan calling the plays were decidedly average, with Callahan ranking 16th, and Linehan having an average ranking of 14th. The reality is that neither were horrible, but they don't compare well to McCarthy, Moore and Garrett. Conclusions: The combination of McCarthy and Moore is likely to serve the Cowboys well, as long as McCarthy allows Moore to keep innovating. Also, Garrett will likely make a drastic improvement in the Giants performance, if they choose to hire him.