Nothing wrong with retread. Of the last 10 Super Bowl winning coaches, 8 of them have been a coach on his 2nd+ team. 8 out of 11 if you go one year further. If you go back a few more years it gets closer to 500.
Just hire whoever JS thinks is best for the team.
Andy Reid (pat mahomes x2)
Sean McVay (first job, stafford)
Bruce Arians (tom brady)
Bill Belichick (tom brady x3)
Doug Pederson (first job, wentz)
Gary Kubiak (peyton manning)
Pete Carroll (10 year gap, rw)
John Harbaugh (first job, flacco)
Tom Coughlin (eli manning)
Mike McCarthy (first job, rodgers)
Sean Payton (first job, brees)
Out of the last 11 Super Bowl winning coaches, 5 of them were on their first job.
Out of the last 11 Super Bowl winning coaches who had previous jobs, 5/6 of them coached a HOF QB in that SB.
Out of the last 11 Super Bowl winning coaches who were on their first job, only 3/5 of them coached HOF QBs.
8/11 SB winners had HOF QBs.
So, I guess this adds to your point. What we want for our best chance to win a SB is a HOF QB.
Out of the 3 non HOF SB winning QBs, 2/3 of them were from first-job coaches.