Gibbs, who completed 18 of 38 passes, threw touchdowns of 23 and 9 yards in the first half as the Braves (4-6, 4-4) took a 14-10 lead into halftime.
After Walker's first rushing touchdown put Alcorn State back ahead 21-17, Johnson broke a 46-yard run to give the Tigers a 24-21 fourth-quarter lead.
But Alcorn was not finished, as Walker's second touchdown, this time from 1-yard out, swung the lead back into Alcorn State's favor, 27-24, and Gibbs' third touchdown pass put the game away.
With starting quarterback Thomas Sirk out indefinitely with a torn Achilles, Duke will turn to Parker Boehme to lead the offense.
Kentucky will have to replace five starters on defense in 2016, and its deep recruiting class should help address the need.
A group of transfer quarterbacks and the top wide receiver recruit in the country are among those who could emerge to make a big impact in the Pac-12.
Now is the perfect time to take a closer look at the strength and weakness of each Big 12 team after signing day, beginning with Baylor.
With signing day behind us, here's an early look at how teams stack up in the Pac-12 heading into next season.
The Spartans went into signing day needing to get stronger at receiver, and they did just that, signing four wideouts including two in the ESPN 300.
|Mississippi Valley State||1-8||1-10|
|Prairie View A&M||8-1||8-2|