Erik ten Hag is hardly a managerial veteran. The Manchester United boss only celebrated his 54 birthday in February, after all. But it’s a measure to he remarkable success Kieran McKenna has enjoyed so early on in his own managerial career that a man 17 years Ten Hag’s junior has one Ipswich Town legend convinced that ‘he would be able to go to Manchester United today and run that football club’. At least, that is the view of Darren Ambrose, Ipswich icon. 37-year-old McKenna, previously a member of Ole Gunnar Solskjaer’s backroom staff alongside Michael Carrick – also now working in the Champi…