Despite his strong preseason and reliable pass coverage Kyle Arrington — the cornerback with a new $16 million contract and a fluctuating position on the defensive backfield depth chart — could be considered a player with something to prove. If so his opportunistic thievery yesterday should silence any such questions for at least this week. In a game full of momentum swings and miscues Arrington’s ball-hawking hands caused two Buffalo Bills fumbles that led to a pair of Tom Brady touchdown passes in the Patriots’ 23-21 win. It wasn’t an NFL Films-worthy performance by either side but with Arrington setting the tone early the Pats were able to take advantage of some hard-earned chances. “It was just one of those things that whenever we had a chance to make a play on the ball we were going for it” Arrington who was in on eight tackles said. “And we were fortunate to make enough plays in the game. It wasn’t perfect but we made enough plays to win.” The first of such plays came on Buffalo’s second play of the season. As running back C.J. Spiller tried to find daylight off left tackle Arrington intervened and stripped the ball loose leading to defensive lineman Tommy Kelly’s fumble recovery and a Patriots possession at the Buffalo 16. Three plays later Brady found wide receiver Julian Edelman in the back of the end zone to capitalize on the turnover and put the Pats up 7-0. “Sometimes you’ve got to gamble out there” Arrington said. “It’s a game of opportunity and you try to capitalize as much as possible.”