This seemed inevitable for months now, from the moment Reggie Bush injured his ankle during the fifth week of the season and Theo Riddick darted through the Minnesota defense on the opening drive the following week.
Even when the Lions drafted Riddick in the sixth round of the 2013 draft, his skills were similar enough to Bush's -- then the Lions' top offseason free-agent acquisition -- that it seemed like the team signed its present and drafted its future, all in the same two-month span.
It turns out that's exactly what happened, as the Lions cut Bush on Wednesday after two years with the team and with two years left on his four-year contract.
But Bush's fate with the Lions was sealed as much by his inability to stay on the field -- he played 11 games in 2014 and has had only two seasons in which he played all 16 games -- as it was Riddick's emergence in the backfield.
The questions continued to come throughout the season, especially as Riddick played well in Bush's absence. Bush still had the occasional explosiveness. Riddick was the more consistent presence as a receiving back, which essentially became the role for Bush and Riddick in the Detroit offense.
Riddick, who has only 29 career carries and no rush longer than 9 yards, will never be mistaken for a between-the-tackles back, but neither was Bush. When it comes to receiving, though, Riddick had the superior season, even with fewer repetitions. Riddick had 34 catches for 316 yards and four touchdowns, many of those plays coming in big spots.
He had the game-winning touchdown against Miami. He had a massive one-handed catch on the final drive against Atlanta, as well as a touchdown reception. Not coincidentally, Riddick had his most receptions (eight) and targets (12) against Atlanta, a game in which Bush was sidelined.
Riddick was productive when he played but was often behind Bush when he was healthy -- relegating Riddick to becoming the two-minute back because of his work out of the backfield.
Now his role could greatly expand in 2015, or at least he'll be the first player to have a shot at taking the snaps vacated by Bush's release.
"It depends on what we want to do, but he's capable of carrying it more than what we gave it to him," Lions coach Jim Caldwell said last week. "But he’s also, you can also see his numbers of out of the backfield, catching the ball. Things of that nature, they jump out at you.
"So he's got a unique skill there, but he's also a good ball carrier, so we'll see how that goes."