Despite picking at the top of the 2013 NFL Draft the Chiefs haven’t received much production from their rookie class. But they struck it big in what can be called their second draft. Those are the seven players the Chiefs claimed on waivers during the opening week of the season after NFL teams reduced their rosters to 53 players. The Chiefs based on their 2-14 record of a year ago had first crack at every player waived during the first three weeks of the regular season. And while it’s commonplace for teams to churn the bottom of their rosters and pick up a player or two the Chiefs’ plucking so many who have contributed so much so soon to a 5-0 start is unusual if not unprecedented. Two of the second seven — tight end Sean McGrath and cornerback Marcus Cooper — have started games and scored touchdowns. McGrath caught a touchdown pass against the New York Giants that gave the Chiefs a 7-0 lead; and Cooper recovered a muffed punt in the end zone at Tennessee for the first score in that game. The other five members of the Second Draft — wide receiver Chad Hall linebacker Dezman Moses linebacker James Michael Johnson cornerback Ron Parker and defensive lineman Jaye Howard — have been primarily special teams players though. Parker contributed a sack forced fumble and fumble recovery against Dallas. “From the first day when we came in as a group all the coaches told us who they claimed and that they were excited and happy for us to be here” said Parker who was picked up from Seattle. “From what it looks like right now everybody took whatever opportunity they were given and has done well. “Every week it’s been a new guy who was picked off waivers making a big play. You never who it’s going to be … next week it might be somebody else. I’m just glad everything has worked out the way they pictured it.” McGrath also claimed from Seattle has taken advantage of injuries to Anthony Fasano and Travis Kelce. He has started four games catching 15 passes for 180 yards and a touchdown. Cooper claimed from San Francisco started against the New York Giants when Brandon Flowers was out with an injury. He remained at left corner for most of last week’s game at Tennessee playing 56 snaps enabling Flowers to cover the slot receiver. Cooper not only recovered the muffed punt he intercepted a pass that preserved the Chiefs’ lead in the fourth quarter. Cooper is playing so much in the secondary special teams coordinator Dave Toub is worried about losing him on special teams. “That’s the way it is” Toub said. “Good players end up moving up … I will try to keep using him on punt return when he’s coming off the field and not having to go back out and play defense. … “He’s got really good instincts. (On the fumble recovery) instead of just trying to pick it up he shields the guy prevents him from getting it and then falls on the ball. Things like that you just can’t teach.” Cooper is the only rookie among the seven players taken in the Second Draft. The others all came to the Chiefs with NFL experience including Johnson a fourth-round pick by Cleveland who started eight games in 2012; and Moses who started six games last year for Green Bay as an undrafted free agent.