AVB had nothing to do with the signings. It was all Daniel Levy and his technical director, Franco Baldini.
From what I've read in the past, AVB didn't want Erik Lamela, Nacer Chadli, Vlad Chiriches and Christian Eriksen, instead asking for Hulk, Joao Moutinho and David Villa. He did want Paulinho, Etienne Capoue and Roberto Soldado, so there's hits and misses on both sides.
Also, regardless of how good or bad the signings were making that many changes so quickly was always going to leave them in a bit of a mess. A few signings of high quality would have done.