To play you need to control the midfield, there's no point playing with 2 (1 really, Ramsey can't play deep) in the middle and 4/5 attackers. They were pushed up against the Danish defence with nobody linking the attack and defence. Allen needed Smith/Ampadu alongside him to screen the back four so Allen could link the defence and attack with Ramsey further forward to do some damage, that was obvious from the first ten minutes