Will the 49ers select more redshirt players in this draft? It's certainly possible.Last year, the Niners drafted two highly touted prospects, running back Marcus Lattimore and defensive lineman Tank Carradine, despite the fact each had suffered an injury in his final college season and would be unavailable to play in 2013.Lattimore and Carradine are healthy and fit now after sitting out a season, and could be big contributors in 2014.Now the 49ers – with a still-deep roster and 11 picks – might consider doing the same thing again in the draft that begins May 8.The 49ers have former Oklahoma cornerback Aaron Colvin in for a visit this week. Colvin tore his ACL in January during a practice for the Senior Bowl, and isn't expected to be able to play in 2014. He had surgery in January and has been rehabbing in Florida, according to Matt Barrows of the Sacramento Bee. Lemonier Gives 49ers Linebacking InsuranceColvin, who is 5-foot-11 and 177 pounds, has long arms – a favorite trait of 49ers GM Trent Baalke – and is reported to be a physical cornerback who is good in coverage and run support. He had 33 career starts for the Sooners, for whom he twice received...