It is not easy following in the footsteps of the Manning brothers. Two young quarterbacks found that out Sunday, a day after the NFL’s deadline for cutting rosters to 53 players.

Paxton Lynch, a former first-round pick in 2016 by the Denver Broncos, was waived by the team after failing to live up to the expectation that he would fill the vacancy left by Peyton Manning following his retirement after Super Bowl 50.

While Lynch was given three years to prove his ability to the Broncos, the New York Giants offered an even shorter grace period to their third-round pick from 2017, Davis Webb, whom they released Sunday. The move leaves Peyton’s 37-year-old brother, Eli Manning, without a clear successor as he begins his 15th season.

Webb, 23, impressed a year ago during the preseason but has never appeared in a regular-season game in the NFL. Even when former Giants coach Ben McAdoo benched Manning late in the year, it was the veteran backup, Geno Smith, who stepped into the starting role while Webb remained waiting in the wings.

A tall, strong-armed quarterback out of the University of California, Berkeley, Webb showed flashes of potential. He held a firm grip on the backup role this summer, taking snaps with the second team throughout the preseason.

But after training camp, the franchise’s new brain trust, including coach Pat Shurmur and general manager Dave Gettleman, was apparently unconvinced that Webb was the best option as Manning’s heir apparent. The decision to keep four quarterbacks — Kyle Lauletta and Alex Tanney were the other two — on the roster at Saturday’s deadline was a sign that the team was ready to move on from Webb.

On Sunday, the Giants made a slew of additional roster moves, waiving five more players in order to acquire six players recently cut by other teams, including defensive end Mario Edwards Jr. and three defensive backs.

The other Giants players waived were offensive lineman John Jerry, kick returner Hunter Sharp, defensive back William Gay, defensive tackle Josh Banks and tight end Jerell Adams.

Webb, who went 28 of 53 for 283 yards and one touchdown in three preseason games, looked shaky in the preseason opener against the Cleveland Browns before tightening up his play as the starter in the second game against the Detroit Lions. He was held out of the final preseason game against the New England Patriots. Shurmur said afterward that the team wanted to take a longer look at Tanney and Lauletta, a rookie out of the University of Richmond selected in the fourth round of the draft.

The Giants reaffirmed their faith in Manning’s ability to lead the team in the near term when they passed on selecting a quarterback with the second overall pick in this year’s draft and instead took a running back, Saquon Barkley.

It was seen as a vote of confidence for Webb as well. But the succession plan has apparently changed.

In Denver, things soured quickly for Lynch. The Broncos traded up to get the 6-foot-7 gunslinger out of the University of Memphis at the No. 26 spot in the 2016 draft, just months after Peyton Manning had led them to a Super Bowl title.

But in three seasons, Lynch, 24, failed to outshine his competitor for the starting quarterback spot, Trevor Siemian (career passer rating: 79.9), and even lost the job as Case Keenum’s backup to a former seventh-round pick, Chad Kelly, this summer.

In the team’s second preseason game, Lynch was booed by the home fans after taking two sacks and completing just five passes. One fan even started a GoFundMe to raise money for the Broncos to afford to cut Lynch, who is owed $1.9 million this season.

It is unclear if the fund ever reached its $600,000 goal. But the fan got what he hoped for, anyway.