Shanahan mum on 49ers’ positional depth ahead of roster cutdown day

Kyle Shanahan normally is as up front with media as possible, but on Sunday the 49ers head coach was uncharacteristically, yet understandably, secretive about his thoughts on the depth at certain positions. With all clubs strategizing how they will cut their rosters down to 53 players on Tuesday by 1 p.m. PT, Shanahan is staying mum on who might or might not be on the bubble. The status of wide receiver Brandon Aiyuk and left tackle Trent Williams affect how the front office will build their group, but how the team stacks each position will be kept secret. "It's just connecting all the positions," Shanahan said on Sunday. "You have the unknowns with B.A. and Trent right now. And then we have a lot of good competition at a number of positions, whether to go light in certain places, heavier than some others. "Definitely don't want to get any specifics though, because that's what all 32 teams are doing right now, watching everyone's rosters, trying to listen to everything and figure out which guys they can get." The 49ers received positive news on defensive linemen Yetur Gross-Matos and Leonard Floyd, who both suffered knee injuries in San Francisco's preseason finale against the Las...