Kittle misses practice; Shanahan says he’s ‘made a lot of progress’

Jordan Willis is headed to the IR with a knee injury The 49ers returned to practice Wednesday but were without a few key players. Left tackle Trent Williams sat out due to a veteran’s day off. Linebacker Dre Greenlaw is limited with an elbow injury. Backup offensive lineman Daniel Brunskill continued to sit out with a hamstring injury. George Kittle…