Hull was the starting center for the Generals from 1983 to 1985 where he blocked for Herschel Walker all 3 years. Walker broke the pro football record for rushing yards in a single season with 2,411 in 1985 with the Generals - Hull was a key cog in their attack all three seasons together.
The Bills ran out of gas in 1994, finishing only with a won-lost record of 7–9. But in 1995, the Bills came back to prominence by winning the AFC east divisional title to beat the Dolphins in a wild-card game of the 1995–96 NFL playoffs, rushing for a ridiculous 334 yards, as Hull mauled the opposing defensive tacklesTim Bowens and Chuck Klingbeil as thoroughly as middle linebackerBryan Cox, but they lost a divisional round game to the Steelers. In 1996, Hull's final year in the NFL, the Bills made the playoffs but lost a wild-card game to the Jacksonville Jaguars. In 1997, he was replaced by sophomore Dusty Zeigler.
From 1986 to 1993, he played next to Ritcher at left guard, forming a fine tandem in their hurry-up offense, and in the final two years with a very strong Ruben Brown. During Hull's eleven-year career in Buffalo, he played in 121 consecutive games from 1986 to 1993, as the Bills enjoyed eight winning seasons and won four consecutive AFC titles. Named to the Pro Bowl three times, he was also one of the team's captains for his final seven years. Most notably, he was the starting center for Buffalo during their record four straight Super Bowl appearances from 1990 to 1993, though all losses.
Hull was selected to the Greater Buffalo Sports Hall of Fame in 1997, inducted into the Mississippi State University Sports Hall of Fame in 2000, received the Ralph C. Wilson Distinguished Service Award in 2001, was selected to the Mississippi Sports Hall of Fame in 2002 and was the 19th inductee to the Wall of Fame at Ralph Wilson Stadium in Buffalo in 2002. In 2012, he was added to Mississippi State University's Ring of Honor on Davis Wade Stadium, which is the highest recognition for Mississippi State Football. In 2013, the Kent Hull Trophy was announced and is to be given annually to the best collegiate offensive lineman in the State of Mississippi. The first annual recipient was announced on November 27, 2013 to offensive guard Gabe Jackson of Mississippi State.
Hull died at home in Greenwood, Mississippi on October 18, 2011. The cause was announced as a gastrointestinal bleed stemming from chronic liver disease, a condition which he had been battling for some time. A review of his career was published in the New York Times of November 7, 2011.