By Frank Taddeo As most fantasy football managers can attest, drafting running backs is crucial to constructing a championship roster In last night’s Hall of Fame game between the Raiders and Jaguars, NFL fans got to see one of the best deep sleepers at the position. Zamir White, who the Raiders selected in the fourth round out of Georgia, showed excellent burst and solid hands out of the backfield. There had been some questions prior to the draft as to whether White could be productive at the NFL level despite averaging 5.3 yards per carry over a span of 37 games playing against elite competi…