I always thought Eddie's strongest suit was his ability to "spot a player".
Players like Lyle Taylor, Harry Cornick, Dannys Ings is a more obvious one, all bought in to develop into League One players for us but who now excel at levels far higher than we were developing them for.
His biggest tactical weakness, strangely, was defending. Considering he was a CB it never improved, even when he changed the tactics to focus on it. I think that was the beginning of an 18 month spiral resulting in his ultimate "downfall", as well as some potential uncharacteristic unrest behind the scenes coming from players (which of course he never alluded to, being the stoic gent he is).
The positives are almost too numerous to mention but the last 18 months to 2 years were just tremendously disapppointing given the players we had, the injuries we had, Eddie's seeming reliance on his "favourites" who were no longer cutting it and him seeming unable to see the glaringly obvious solutions that all us forum experts had identified months prior. The team lost its identity and instead of being devastating in attack but weak at that back, we just became a bit weak everywhere. So less goals but still just as crap at the back.
An appointment at Celtic will make or break him. Succeed and he'll be at somewhere like Arsenal in a few seasons' time but I feel any failure might really set him back.