Does 49ers' reported signing of QB Thad Lewis portend a Colin Kaepernick trade to Broncos?

SANTA CLARA, Calif. -- The only announced move the San Francisco 49ers made on the first day of free agency Wednesday was re-signing one of their own in nose tackle Ian Williams.

They did, however, reportedly agree to terms on a one-year deal with quarterback Thad Lewis, who was with new coach Chip Kelly in Philadelphia last season, though he never played in a game.

In joining a QB room in Santa Clara that already has Blaine Gabbert, Dylan Thompson and Colin Kaepernick, Lewis would seemingly be the odd man out.

Lewis has not played in an NFL game since 2013, when he went 2-3 for the Buffalo Bills after going 0-1 for the Cleveland Browns a season earlier. In seven career games, he has a passer rating of 81.4 in completing 60.8 percent of his attempts for 1,296 yards, five touchdowns and four interceptions.

Still, the Brock Osweiler-departing-Denver-for-Houston development seemingly makes Kaepernick perfect trade bait for the Super Bowl-champion Broncos, which has been suggested here before.

And Broncos general manager John Elway told reporters during a joint workout with the 49ers last August in Colorado he was a Kaepernick fan.

“I’ve always liked Colin,” Elway said at the time. “He’s very athletic and he can make a lot of big plays. He’s doing more within the pocket ... if he continues to do that, it will help him.

“He’s a great athlete, and he’s got that big-play ability to avoid things and make things happen.”

And that also makes Robert Griffin III all the more intriguing.

Beyond that on Wednesday -- a report also had inside-linebackers coach Hardy Nickerson, on the job for less than two months, leaving to join Lovie Smith in college at Illinois (Hardy, we hardly knew ye?) -- the Niners are also interested in running back Lance Dunbar and plan on bringing him to Santa Clara for a visit, per ESPN NFL Insider Adam Caplan.

“Chip Kelly sees Dunbar as a Darren Sproles type of player (if healthy),” Caplan tweeted. “Mismatch for LBs.”

The 5-foot-8, 191-pound Dunbar is, however, coming off a torn ACL in his left knee last season, when he caught a career-high 21 passes for 215 yards and carried the ball five times for 67 yards in four games. He has missed 23 games in his four-year career.