They thought they are big enough not to fall and were throwing money at players without a clear plan or a specific system. Realised they fucked up and wasted their money and now far away from other teams. Under the pressure of fans they went for Rangnick to help and fix thier football operations , rejected them, they begged him and he demanded some terms he thought they won't go for but they were desperate. From the inside he saw what idiots he is dealing with, trashed them at public and left. Their solution, give Erik ten Hag total control of transfers. What could go wrong ? now they are scared of wasting more money only to fall further behind and the same time their manager need to find and identify targets by himself unlike other managers at a well run club and the funny thing is their greatest manager Ferguson , is one of the big reason they are mess now.