Regarding your last sentence.... On thing I would state here is that AVB was sacked after we'd had a relatively stable period (stable for us anyway) with Redknapp in charge of the club. Sacking AVB after 16 months or whatever it was after having Redknapp in for 4 years prior to that was going to lead to our third manager in over 5 years
Whereas over a similar five year period just gone we've had Pochettino, Mourinho, Mason, Nuno, Conte, Stellini, Mason, Postegcoglou. Sacking Postecoglou would see us bringing 9th manager in 5 years and that's before you consider that we'd likely need some sort of caretaker before getting the manager in.