IU job is better long term than the Celtics job.
1) Brad is a better fit in College Basketball where he would immediately be one of the top college coaches in the country, and the best under age 50. It is always good to be#1.
2) NBA jobs are usually not long term gigs. Unless you are Gregg Popovich, NBA Head Coaches are Larry Brown nomad types, hired gun coach types. Brad seems to be more of a Indiana stable employment kind of guy,
3) Living and raising a family in Bloomington, IN is >>> Better than living in cold, wintery, old, Boston, MA
4) Taxes in Indiana are much less than living in Massachusetts.
5) Nick Saban was once a NFL pro football head coach and is now THE GUY in college football while coaching at Bama. Nobody even remembers that he once was a failed NFL Coach, only that now Saban is the best coach in College Football and is knocking on Bear Bryant's door as the best coach in BAMA and SEC History. Competing in the shadow of a college coaching legend Bear Bryant didn't deter or stop Saban from taking the Bama job after several coaches were hired and had limited success and failed to stay at Bama after Bear Bryant.
6) Brad would be THE MAN in Indiana Basketball, and a state-wide celebrity for life.
7) Brad would almost assuredly restore IU to Blue Blood greatness, and would bring up images of a young Coach K at a Top 5 Basketball Blue Blood.
9) Brad checks the NBA Coaching box for top level recruits with NBA aspirations.
10) Brad can not publically say he is interested in the IU job for all of the above obvious Long Term advantages over the current and likely temporary Celtics job.
11) Brad is an Indiana guy with Indiana roots and just happens to be one of the brightest young basketball coaches on the planet who would absolutely succeed in a big way at IU.
12) Brad's next NBA coaching job might be at a very undesirable location, for a team that is poorly managed, and with no resourses to improve and be successful.