When the 49ers and Chiefs swapped disappointing, first-round receivers before this past season, it was a roll of the dice for both teams.A.J. Jenkins had flopped in San Francisco – where he never caught a regular-season pass – and Kansas City was down on Jonathan Baldwin, who made a few big plays for the Chiefs but often disappeared as well.But, it was a chance for both to get a fresh start.Now, after a full season, it's Baldwin who now appears to be a bigger bust than Jenkins.Baldwin, a big (6-foot-4, 230-pounder) with good speed, became an afterthought in San Francisco, even when the 49ers were missing Michael Crabtree, Mario Manningham and rookie Quinton Patton, all out with injuries. Baldwin played in just seven games and had only three catches on nine throws his way for 28 yards. It was a steep decline from his so-so production of the previous two seasons, when he caught 20 balls in 2012 and 21 his rookie season of 2011.Jenkins, meanwhile, had just one catch for the Chiefs through the first 10 games, but was much better in November and December with two three-reception games. For the season he finished with eight catches in 17 targets for 130 yards and a 16.3-yard...