With spring football around the corner, The Athletic’s college football experts broke down the most pressing question facing each Power 5 team. Here’s what to watch for in the Big Ten (and check out our breakdown of the ACC):

Illinois

Will Aaron Henry extend the momentum built by Ryan Walters on defense?

At 37, Walters is gone to coach Purdue after two strong seasons as the defensive coordinator for Bret Bielema. The Illini head coach quickly promoted Henry, who’s 34 and coached the Illinois defensive backs with strong results. Illinois led the nation against the pass and in scoring defense, interceptions and takeaways last season. Henry’s star cornerback, Devon Witherspoon, is gone early to bid for an NFL job, along with standout safety Sydney Brown, leaving Henry to rebuild. — Mitch Sherman

Indiana

Can Tom Allen rebuild again?

Two years ago, Allen signed a seven-year contract extension that will take him through the 2027 season. The Hoosiers are 2-16 in Big Ten games since. Can Allen recapture the magic that made him feel like college football’s Ted Lasso? Indiana will have to do it without a new quarterback and without its best defensive player after Dasan McCullough transferred to Oklahoma. How Allen approaches culture rebuilding this spring will be paramount. — Pete Sampson

Iowa

Can the new faces improve the offense?

The Hawkeyes added perhaps five new offensive starters in the transfer portal, and the challenge for offensive coordinator Brian Ferentz (yes, he’s back) is to incorporate those new pieces and build a competent offense. It all starts with former Michigan quarterback Cade McNamara, who will try to execute on a unit that finished with 251.6 yards per game (130th nationally), the lowest for a Big Ten team this century.