"Jim Harbaugh had Doug Baldwin on the line and let him get away.On the final day of the draft in April, Harbaugh dialed Baldwin, one of his wide receivers at Stanford, and told him the 49ers weren't going to select him. Instead he said they were interested in signing him as a free agent when the lockout ended.It's one of the few personnel miscalculations Harbaugh and the 49ers' front office have made this year. Baldwin signed with Seattle instead, and he not only landed a spot on the Seahawks final roster, he has emerged as their top receiver.He has 46 catches for 731 yards and three touchdowns, including a 55-yard score against the 49ers in Week 1. He's on pace to become the first undrafted rookie to lead his team in receptions and receiving yards since Bill Groman of the Houston Oilers in 1960.Baldwin missed practice Thursday with an ankle injury, but he's expected to play against the 49ers on Saturday in Seattle.Among rookies, Baldwin trails only Cincinnati's A.J. Green, Baltimore's Torrey Smith and Atlanta's Julio Jones in receiving yards. Green and Jones were picked in the first round; Smith went in the second.Wide receiver, meanwhile, is perhaps the 49ers' most threadbare position, due in part to injuries."