Liverpool legend Jamie Carragher has claimed that Arsenal goalkeeper David Raya is the “biggest disappointment” so far this season. Arsenal left it till the dying embers to beat Luton Town 4-3 on Tuesday night as Declan Rice rose highest to plant a header past goalkeeper Thomas Kaminski. The Gunners extended their lead at the top of the Premier League after coming out on top in that thrilling affair, however, it could have been a more comfortable scoreline if David Raya hadn’t of gifted the hosts a couple of goals. Raya was at fault for Luton’s second goal as his weak attempt to claim a cross …