SANTA CLARA, Calif. -- After Thursday nights loss to the Arizona Cardinals, San Francisco 49ers coach Chip Kelly said he plans to examine everything in the coming days, including the potential for a change at quarterback from Blaine Gabbert to Colin Kaepernick.I dont think anybody played well on offense, Kelly said. Nobody did.The coach has stood by Gabbert as his starter for the first five weeks, but Kelly will put the quarterback position under the microscope in the next 10 days before the 49ers game at Buffalo.I think were going to look at everything, Kelly said. We are 1-4, we have got to make sure were going out there and giving us the best chance to win so were going to look at everything.Kelly said Gabbert played his best game of the season last week against Dallas, but Kelly didnt have a similar opinion of Gabberts performance in Thursday nights 33-21 loss. Gabbert finished 18-of-31 for 162 yards with one touchdown and two interceptions for a QBR of 47.9 and a passer rating of 56.1. Gabbert also absorbed seven sacks.Its extremely frustrating, Gabbert said. I let this team and this organization down tonight and did not play good whatsoever, and thats on me. I had two crucial turnovers there that led to points for the Cardinals and that was the difference in the game right there. I got to do a better job protecting the football and leading this team to scoring more points and winning games.Late in the third quarter, with cornerback Chris Davis being tended to with a knee injury, a large group of 49ers fans began loudly chanting, We want Kaep. Former 49ers tackle Anthony Davis even took to Twitter to advocate a change to Kaepernick.Kaepernick changed and quickly departed the Niners locker room after the loss. He did not speak to reporters, but Gabbert was standing a few feet away in the auditorium where Kelly was answering questions about his job security.Gabbert said he understood why Kelly would want to evaluate the position before the teams Oct. 16 game in Buffalo.Yeah, Ive got to play better, Gabbert said. Theres no question to that. Ive got to do a better job leading this football team, executing this offense, scoring points, winning games, the whole nine yards. Thats just the way it goes. Ive got to play better.In the past, Kelly has refrained from considering a change in part because he didnt believe Kaepernick was in peak physical condition. Kaepernick spent most of the offseason recovering from shoulder, thumb and knee injuries and then had a setback during the preseason because of right shoulder fatigue.Kelly has said hed like to see Kaepernick get closer to his former 225-pound playing weight, believing that would potentially give him the chance to play at a high level -- similar to his success in 2012 and 13.Kelly also confirmed that Gabbert has been better than Kaepernick in practice, though the coach acknowledged that hasnt carried over to games.Blaine has done a really nice job in practice, yes, Kelly said. I would expect us to execute in practice now. Its a controlled environment; youre in a lot of trouble if youre not having any success in practice, either. I think thats what we have to make sure we can do is can we take it from the practice field to the game field, and were not doing that right now on the offensive side of the ball.Through the first five games, Gabbert ranks near the bottom of the NFL in yards per attempt, yards per game and passer rating. According to Elias Sports Bureau research, Gabbert fell to 9-31 in his career as a starter with Thursday nights loss, which tied him with Warren Moon for the second-worst record through a quarterbacks first 40 career starts since 1970.When Kaepernick last played, he wasnt faring much better. He was 26th in the NFL in QBR, 27th in completion percentage and 29th in yards per attempt during the first eight weeks of the 2015 season before landing on injured reserve.Kelly said the discussion and decision on quarterback wont be made right away, but he did say it would be his choice and that general manager Trent Baalke doesnt get involved in such matters.Any decision thats made with the current roster is a coaching staff thing, Kelly said. Trent had never come in and said this guy has to play or that guy has to play. Trent does a great job of acquiring talent and getting players on this football team, but hes never once told me who has to play where and what the lineup is and all that. Cheap Mariners Jerseys . Darren Helm scored on Detroits sixth attempt in the shootout and then Jonas Gustavsson stopped Andrew Shaws shot, lifting the Detroit Red Wings to a 5-4 win over the Chicago Blackhawks on Wednesday night. Fake Mariners Jerseys . 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Next closest are the New England Patriots at $3.4 billion.Earlier this year, Forbes cited Jerry Jones team as the worlds most valuable franchise.Dallas has $700 million in revenues and $300 million in operating income.The average NFL team is worth $2.34 billion, a 19 percent increase over last year. That increase is primarily due to more rights fees for Thursday night games, the Rams relocation from St. Louis to Los Angeles, the Vikings moving into their new stadium in Minneapolis and the Atlanta Falcons nearing completion of their new stadium.Stan Kroenkes Rams made the biggest change in value, up 100 percennt.dddddddddddd.Team values are determined by equity plus net debt and based on each teams current stadium (with adjustments for pending new stadiums and renovations). Revenue and operating income (earnings before interest, taxes, depreciation and amortization) are for the 2015 season, including any net of stadium debt service. Revenue from non-NFL events such as concerts and stadium tours, is included when such revenue goes to the team owner or owners.The New York Giants ($3.1 billion), San Francisco 49ers ($3.0 billion) and Washington Redskins ($2.95 billion) round out Forbes top five.Buffalo has the lowest team worth at $1.5 billion.---AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL---www.forbes.com/nfl ' ' '