The FA Cup quarter finals took place over the weekend, with Manchester United, Arsenal, Chelsea and Manchester City booking their place in the last four at the expense of Norwich, Sheffield United Leicester and Newcastle. It was victory all round for the visitors as United recorded a 2-1 victory at Norwich and Arsenal beat Sheffield United by the same scoreline, while Chelsea won 1-0 at Leicester and City secured a 2-0 win over Newcastle. So what did we learn from the FA Cup quarter finals?...