The Denver Broncos sign wide receiver Wes Welker. The Detroit Lions get Reggie Bush for their backfield. And the New England Patriots ink rising slot receiver Danny Amendola to replace Welker.

The Philadelphia Eagles signed a bunch of free agents during the first day of NFL free agency late Tuesday too. But you probably never heard of most of the players.

Such is the case maybe for how new Coach Chip Kelly is putting together the team's roster for next year. He seems to be focusing more on developing a unit—like a team of college players—than building a group of All-Pros and Dream Teamers.

There's not much star power in these signings.

It's nice, though, to hear Isaac Sopoaga, the new defensive tackle from the San Francisco 49ers, state at a press conference Wednesday that the team is going to "shock the world."

That confidence is great. But right now, it's best not to be boastful, especially with a team coming off four wins and having a new coach, who will be under lots of public pressure and scrutiny to right this ship.

Former Houston Texans tight end James Casey is another piece to the puzzle, a veteran whom Kelly can utilize for his versality in this up-tempo offense since Casey can also play fullback.

Jason Phillips is a reserve linebacker who will probably play mostly on special teams. He has logged time with the Baltimore Ravens and Carolina Panthers.

Right now, former St. Louis Rams starter Bradley Fletcher might fill a vacancy at cornerback now that Nnamdi Asomugha has been released and Dominique Rodgers-Cromartie has signed with Denver.

Raise your hands if you ever heard of Fletcher before? The same goes with Phillips, Casey and Sopoaga.

Now Patrick Chung is a name some people may know.

Chung played safety for the New England Patriots and hopefully will provide a lift to the Birds secondary provided he can stay healthy.

Late Thursday, the team continued to focus on the secondary by signing Baltimore Ravens corner Cary Williams and New York Giants safety Kenny Phillips.

And, at the end of the day, the team picked up Texans linebacker Connor Barwin, signing him to a six-year deal.

The focus this free agency has really been on the defense, certainly a big issue after the past two years. Maybe these guys can tackle too.

So the team signed a bunch of players and it will be interesting to see how they fit in and compete.

But maybe that how's the Birds want to operate this year. Maybe Kelly wants them to stay under the radar and become a team that plays well and plays hard.

And maybe, just maybe—as Sopoaga says—this team will "shock the world."