49ers believe in Aiyuk's elite speed

Daily 49ers blog for NBC Bay Area website: Some NFL teams weren't sold on the speed of WR Brandon Aiyuk because of his rather disappointing 40-yard time at the NFL Combine. The Niners knew otherwise. https://www.nbcbayarea.com/news/sports/new-49ers-receiver-aiyuks-speed-is-indeed-elite/2288838/