KANSAS CITY Kendall Fuller Jersey , Mo. (AP) — Chiefs quarterback EJ Manuel, who was signed this offseason to compete for a backup job, has decided to retire after four seasons with Buffalo and one season with Oakland.Manuel was the 16th overall pick of the Bills in the 2013 draft, going 6-11 while struggling to live up to expectations. He’d been Derek Carr’s backup the past two seasons with the Raiders.His retirement was part of a series of roster moves the Chiefs made Monday.The Chiefs signed wide receiver Rashard Davis, running back Marcus Marshall, tight end Jody Fortson and defensive backs Herb Miller and Andrew Soroh. They also claimed offensive tackle Zach Golditch off waivers from Arizona while waiving wide receivers Andre Lindsey and Sammie Coates, defensive backs Leon McQuay and Dakari Moore and fullback JD Moore.Tight end Tim Ward was placed on the non-football injury list while wide receiver Jamire Jordan Eric Murray Jersey , an undrafted free agent from Fresno State, was placed on injured reserve. Last year, Chiefs quarterback Patrick Mahomes burst onto the scene with one of the greatest seasons in NFL history, reaching 5,000 yards and 50 touchdowns and winning league MVP in his first year as a starter. Surely, he’d have to regress to the mean in Year 2, right?Wrong.Mahomes is actually putting up better numbers through the first three games of this year than he did last year. The season has a long way to go Terrance Smith Jersey , but if he can play over the next 13 games like he has over these three, he’ll obliterate every single-season passing record.Last year, Mahomes totaled 5,097 passing yards. This year, with 1,195 yards through three games, he’s on pace to total 6 Xavier Williams Jersey ,373 yards.Last year, Mahomes totaled 50 touchdowns and 12 interceptions. This year, with 10 touchdowns and no interceptions through three games, he’s on pace to total 53 touchdowns and zero interceptions.Last year, Mahomes completed 66.0 percent of his passes, averaged 8.8 yards per pass, and had a passer rating of 113.8. This year Jordan Lucas Jersey , Mahomes has a 71.9 percent completion rate, an average of 10.5 yards per pass, and a 134.9 passer rating.By any measure, Mahomes is throwing the football better this year than he did last year. Surely, he can’t keep doing this for 13 more games. Can he?