Is Kevin Williams a nose tackle?

Answer 1

No. A nose tackle's job is to control both A gaps (the spaces on either side of the other team's center) and to take on double teams, freeing up other defenders to make the play. Kevin Williams is an Under Tackle, whose job is to fill the B gap (the space between the other team's guard and tackle) on his side and to get into the offensive backfield to disrupt the play. Nose Tackles need to be considerably heavier than Williams is in order to consistently hold their ground.