If he gets a win against the Lions he will tie for third-most wins in NFL history for a rookie coach. Here are the 13 win coaches and the record of their teams in the previous season.
(2011) Jim Harbaugh - 2010 record of 6-10
(1997) Steve Mariucci - 1996 record of 12-4
(2019) Matt LaFleur - 2018 record 6-9-1
1st year coaches with 14 wins:
(2009) Jim Caldwell - 2008 record of 12-4
(1989) George Seifert - 1988 record of 10-6
Looking at that, you could safely argue that he and Harbaugh have had the best rookie campaigns in the history of the NFL. Marriccci had Steve Young, Jerry Rice, Rod Woodson, Brent Jones and on and on. Seifert inherted a super bowl winning team. Caldwall had Manning and Wayne in their prime. What Harbaugh did was probably the most impressive as MLF has Rodgers.