The 49ers didn't trade for one of the best wide receivers in the NFL. But they have signed a receiver who is related to the greatest wide receiver in NFL history. On Thursday, the 49ers agreed to a one-year deal with former Eagles wideout Jordan Matthews, 26, whose mother is a first cousin of Hall-of-Famer Jerry Rice. OK, the acquisition is a comedown for fans hoping for the 49ers to land recently-dealt All-Pros Antonio Brown and Odell Beckham Jr. But the 49ers are hoping Matthews can bolster a wide receiver corps that didn't have a member top 500 yards last season. To do so, Matthews will need to recapture his early career form. From 2014-2016, Matthews averaged 75 catches and 891 yards per season and scored 19 touchdowns. In the past two seasons, he's had 45 catches for 582 yards and has spent time with the Bills and Patriots before he rejoined the Eagles last year for his second stint with team that selected him in the second round of the 2014 draft. Mathews cited the presence of quarterback Jimmy Garoppolo and head coach Kyle Shanahan's scheme as reasons why he "couldn't ask for a better situation." "I feel like they've been doing a ton of stuff just get guys in open space,"...