49ers' McCaffrey is simply 'best in world at what he does'
Briefly

"That's probably part of my insecurities and competitiveness. I want to be a complete back, and I think this dates back to when I was in middle school and high school," McCaffrey said.
"I don't really see any other running back in the NFL lining up in the slot and running double-move routes for touchdowns," tight end George Kittle said.
Read at The Mercury News
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