Appearing on Tuesday's edition of NFL Network's NFL HQ, NFL Media's Albert Breer added context to the recent photographic evidence that Lacy has succeeded in slimming down via workouts with P90X founder Tony Horton in Los Angeles.
Breer described Lacy's transformation as a "remarkable" redistribution of weight from his midsection to his shoulders and arms.
McCarthy firmly believes Lacy has learned that he can't shake nagging injuries and make tacklers miss if he's carrying too much weight.
"I think we'll see definitely a different guy in April," McCarthy said in late February, "and more importantly in July."
A long-held NFL truism is that "the eye in the sky doesn't lie." The game film shows that Lacy is one of the NFL's top 10 running backs when healthy and in reasonable football shape.
Going back to 2014, he was the only player in the league to exceed 100 yards from scrimmage in each season's final nine games, totaling 1,111 yards and nine touchdowns over that dominant stretch.