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Insider: Is Marlon Mack ready to become the Colts' lead back?

The Indianapolis Colts continue their offseason workouts. Marlon Mack, Quincy Wilson, Al Woods and Tarell Basham reflect on last year and look ahead to the upcoming season. Clark Wade/IndyStar

INDIANAPOLIS -- The thing about Marlon Mack’s rookie campaign: It felt so boom or bust. Middle ground? It didn’t exist. He was Sammy Sosa in ’98, roping a home run one minute, striking out the next, never a single or double in sight. A 25-yard burst up the sidelines would be backed up by a six-yard loss.

His game craved consistency. So did the Indianapolis Colts’ lifeless offense.