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The great Bill Walsh, on how he evaluated each position: Now up, defense -
DEFENSIVE TACKLE
Ideal size: 6-2, 290
DEFENSIVE END
Ideal size: 6-5, 275
INSIDE/MIDDLE LINEBACKER
Ideal size: 6-21/2, 250
OUTSIDE LINEBACKER
Ideal size: 6-3, 245
CORNERBACK
Ideal size: 6-2, 195, but good ones come in all sizes
SAFETY
Ideal size: Weak --6-2, 200; Strong -- 6-3, 215