By Ewan Murray After some questionable displays earlier in the season, David Raya has firmly established himself as Arsenal’s first-choice goalkeeper. There was an interesting battle between the Spaniard and Aaron Ramsdale for the jersey in the opening months of the campaign, but Raya has clearly won the war. However, the 28-year-old will not feature against Brentford in Saturday’s late kick-off as the Gunners hunt down a first Premier League title since 2003/04, with Ramsdale coming back into the fold against the Bees. Why David Raya won’t play against BrentfordRaya has become an integral par…