Arsene Wenger has now been expressing his regret over a signing Arsenal missed out on in the past, one that still ‘hurts his heart’. Right now, Edu and Mikel Arteta are likely attempting to execute transfer plans the club have had in place months in advance. Arsenal moved so early to sign Kai Havertz last summer, who officially joined on June 28. The transfer was shortly followed by a £105m move for Declan Rice, a real statement of the club’s intent for the season ahead. Sadly, these kinds of sums weren’t available to Wenger in his final years at the club, who operated amid more frugal circums…