KANSAS CITY, Mo. — His hands balled into fists and his biceps flexed, running back Isiah Pacheco stomped along the Kansas City Chiefs’ sideline, his message accentuated by his demonstrative voice. “Ay, bring that f—— energy!” Pacheco screamed at his offensive teammates, many of them nodding in agreement. “Bring that s—! Bring that s—!” A …
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