With wide receiver Josh Boyce trying his hands at the 2013 NFL Draft and foregoing his senior season, the TCU receiving corps remains incomplete.Missing is that sure-fire first down option or home-run threat Boyce gave the Horned Frogs. So far through spring practice, no one has accepted the challenge, coach Gary Patterson said after practice Thursday.“They’re athletic and they do things, but someone has to step up and go make plays,” Patterson said. “Right now there [are] guys who make plays but not in the big game. I’m talking about a big-game receiver that’s going to step up and make plays, and he relishes the idea that they are going to get in his face and he’s going to make a difference.”The obvious frontrunner is junior Brandon Carter of Euless, who finished second to Boyce in receiving yards with 590 yards on 36 catches and six touchdowns. Carter’s average of 16.4 yards per catch led all Frogs receivers with more than 10 catches last season.Carter also made several highlight-reel receptions throughout the season that bailed his quarterbacks out of danger by keeping an errant throw from being intercepted.However, Patterson said Carter hasn’t answered the call this spring, to the extent that he has run with the second string of receivers over the past few days.Patterson was quick to add that depth-chart decisions change daily during spring practice.Standing in the way of reaching that level of big-game level, Patterson said, is Carter’s performance blocking and his inability to remain a consistent option because of injury.Cautious approachGary Patterson said he is taking a more cautious approach this spring with injured players, hoping the result will be a healthier fall for the Frogs.One such player is junior tight end Steven Bryant, who was lost for the season with a shoulder injury sustained during the first fall scrimmage. Bryant participates in spring practice by simply running and hitting the blocking sled in order to give his shoulder more time to heal and regain strength.“I’ve been slower than I’ve ever been on the ACLs, legs, knees and shoulders,” Patterson said. “We’re going to see if that [helps] us stay healthier in the fall.”Last season’s standout defender, senior cornerback Jason Verrett, has seen the majority of game-speed action and more contact than Bryant since returning from knee surgery, but Verrett still has some work remaining before he is 100 percent.“It gets sore, but he hadn’t done much running until he got back out,” Patterson said.On guardsThe competition for starting offensive guards is being led by sophomores Jamelle Naff and Brady Foltz, who Gary Patterson said are at the top of the depth chart at both the right and left positions as of Thursday.