He declined to talk about the addition of free-agent quarterback Kevin Kolb because the sixth-year player had not yet officially signed a two-year contract he reached on Saturday. Numerous media outlets, including The Associated Press, reported the former Arizona Cardinals starter had agreed to a deal with Buffalo.
Though it's unclear when Kolb will sign, he will be competing with Tarvaris Jackson for the starting job that was left vacant after Buffalo released Ryan Fitzpatrick last month.
"Whoever comes in, what we're looking for is competition at that position," Marrone said. "And then at the end of the day we'll be able to make a decision on who gives us the best chance to win now."
Numerous Bills players credited Marrone and his staff for making a good first impression by having an upbeat approach.
"Yeah, there's a lot of excitement around here," center Eric Wood said. "First day back there is always going to be some new energy, but coach's enthusiasm, a lot of the vets back from Day 1, there's a lot of positive energy around here."
Also not lost among the players were a few cosmetic additions to the team's fieldhouse. The Bills, who haven't made the playoffs since 1999, have hung large banners on the walls of each end zone celebrating their four AFC championships and two AFL titles.
There's also a 20-foot poster of the Lombardi Trophy attached to one wall.
"I like it. A lot of Super Bowl aspirations," Wood said. "That's a good message to have around."
NOTES: Branch, listed at 6-foot-6 and 325 pounds, is entering his seventh NFL season after spending the past two as a starter in Seattle. He played four seasons in Arizona after being selected 33rd overall by the Cardinals in the 2007 draft. ... Last year, Gailey was intending to have the playbook stored on iPads for this season because the NFL was switching its game video to high definition. ... On Tuesday morning, Buffalo re-signed backup running back Tashard Choice, and tight end Dorin Dickerson has accepted the team's tendered contract offer.