KANSAS CITY, Mo. — At age 22, Josh Gordon broke out as one of the NFL’s brightest young stars, already a league leader in receiving and a fast-riser to being one of the best you-have-to-account-for-him threats in the game. At 30 now, Gordon has played in just 64 career games — a mere 37 in the past eight years — because of a slew of suspensions for repeat violations of the NFL’s substance-abuse policy. His talent has offered him yet another chance, this one with the Chiefs, coach Andy Reid and quarterback Patrick Mahomes. Gordon insists he doesn’t feel urgency to make this opportunity stick an…