I think the key mistake Eddie has made was failing to recognise what precisely made his system so effective. For me it was down to the group of players we had at the time and the understanding they had on the pitch rather than being part of some dynamic tactical revolution.
As others have said, we are a team in transition. Some of the old guard has moved on and superior talent has been added. On the whole, the recruitment has been good, but it should have been more apparent that these players weren’t going to fit into a system that essentially was developed in L1.
Now you could argue we should have recruited players specifically to fit Eddie’s system. That’s nonsense because such players simply don’t exist. Very few players with the ability to play in the PL would have much experience playing in a 4-4-2 and that includes players signed from Championship clubs too.
Instead of pigeon holing new recruits into a system which was no longer effective, it would have been better to have evolved the system to reflect the different talent sets of these recruits.