BBC pundit Michael Brown thinks Declan Rice is only ‘getting better and better’ with Arsenal after the England midfielder scored against Brentford in the Premier League. The 25-year-old opened the scoring at Emirates Stadium in the 19th minute on Saturday. He attacked an inviting cross from right-back Ben White to head home past Mark Flekken in the away net. Rice gave the Brentford goalkeeper no chance to stop Arsenal claiming a 1-0 lead. Rice now has six goals in an Arsenal shirt after 38 appearances since joining from West Ham United last July. The 48-cap anchor hit the back of a net just 15…