It was a tale of two halves of the season for Arkansas in 2015. And while the season concluded on a warm and fuzzy note with a 45-23 pasting of Kanas State in the Liberty Bowl, plenty of questions remain for the Razorbacks as they look to keep the momentum barreling forward heading into the 2016 season.

Here are several questions that Arkansas will have to address:

WHO WILL BE UNDER CENTER?

The graduation of Brandon Allen leaves Arkansas with a void at a quarterback after one of the best senior seasons ever for a Razorback signal-caller. Replacing Allen’s 3,440 passing yards and 30 touchdowns will be a tall order. The good thing is Allen left the cupboard of talent at wide receiver virtually full. The only pass catcher not expected to return next fall is Mackey Award-winning tight end Hunter Henry, who declared for the NFL Draft. But sliding into Henry’s starting position is Jeremy Sprinkle, who caught 22 catches for 308 yards and five touchdowns this year.

The new guy under center expects to be young and green, with the most “experienced” of the bunch being Allen’s younger brother, Austin Allen (188 career yards, TD). He’ll be pushed by Southern California transfer Ricky Town and four-star recruit Cole Kelley, as well as Rafe Peavey and Ty Storey. The competition should be compelling storyline starting as earlier as this spring. Arkansas will have the weapons. The question is whether or not they have the right guy under center who can get the ball to them.

WHO CARRIES THE BALL?

Alex Collins has yet to declare for the NFL Draft, but the speculation is that he’ll leave Fayetteville early. Jonathan Williams, Arkansas’ star running back who missed the season due to foot surgery, is also off to seek pro riches. That leaves Bret Bielema the task of replacing two players with 6,536 combined career all-purpose yards.

Kody Walker drew high praise from Bielema for providing a spark for the Hogs offense when spelling Collins. The junior finished second on the team with 338 yards and five touchdowns, ahead of freshman Rawleigh Williams III (254 yards, TD), the sole running back in last year’s recruiting class. Williams’ future is still a question mark after suffering a neck injury midway through the season. One answer to replace Collins could be freshman Devwah Whaley, a four-star running back who spurned the likes of Georgia and Texas A&M to play for Bielema in Fayetteville next fall.

WILL THE O-LINE LOOK THE SAME?

When Frank Ragnow lines up along the Arkansas offensive line for the 2016 season opener, he might not recognize anyone around him. The sophomore right guard could be the lone Razorback starter returning to the Hogs’ offensive line next season, after the graduation of LG Sebastian Tretola and C Mitch Smothers and the possible early defections of underclassmen Denver Kirkland and Dan Skipper to the NFL.

Kirkland, the team’s massive left tackle, has already declared his intentions to test the draft. The unit is also without a coach right now as Sam Pittman bolted Fayetteville to join Kirby Smart’s new staff at Georgia. Strong offensive line play has become a benchmark at Arkansas under head coach Bret Bielema, and the new O-line coach will have big shoes to fill. The Hogs’ line will return three players that saw the field in 2015 in freshman Zach Rogers, sophomore Reeve Koehler and junior Josh Allen. The biggest addition to the unit should be Northwest Mississippi Community College transfer Terrance Malone, a touted three-star recruit.

CAN THEY SHORE UP THEIR SECONDARY?

No one in the SEC gave up more yardage through the air this year than Arkansas, which regressed a bit on defense from the previous season. The Razorbacks are taking steps to bulk up the strength of defensive backs in the form of recruit help — both in the secondary and along the defensive front. Arkansas should return all but Rohan Gaines among its young defensive backs. The question is whether Bret Bielema can ink a much-needed lock-down cornerback via the recruiting process. Among them is four-star cornerback Kristian Fulton, who is expected to announce his choice on National Signing Day, and four-star safety Brandon Jones.

Another way to bolster the secondary is to have a defensive line that consistently puts pressure on the quarterback. The optimal word here for Arkansas’ defensive front is “consistently.” To build up a unit that finished No. 11 in the SEC in sacks and No. 12 in tackles-for-loss. Bielema already has commits from four-star defensive tackles Austin Capps and Briston Guidry, as well as from five-star defensive end McTelvin Agim — the state’s No. 1 prospect. Arkansas is also waiting to hear back on offers to five-star defensive end Rashard Lawrence. Whether the new recruits can come in and make an immediate impact remains to be seen.

CAN ARKANSAS START FASTER IN ’16?

Slow starts have dogged the Hogs the last two seasons. A 1-4 start lowlighted by losses to Toledo and Texas Tech prevented Arkansas from becoming a true contender for the SEC West in a year when they had the talent to compete, with wins over Ole Miss and LSU and an unfortunate fourth-quarter collapse against Alabama.

Last year’s squad was below .500 as late as Week 7 before rattling off four big wins to close out the season 7-6. With wins over Toledo and Texas Tech, plus if their game-winning field goal attempt isn’t blocked by Mississippi State, you’re looking at an Arkansas team that could easily have been 11-2. But seasons aren’t judged by “what-ifs.” One of the biggest questions facing Bielema in his fourth season in Fayetteville is whether or not the Razorbacks can put the foot on the gas from Week 1 and not relent all year.