Im not sure that getting rid of a player or too would have helped, he ripped down the coaching staff and say the consequence, who sou he have replaced rio with, realistically distant or jagielka which would have destabilised Moyes just as much. I think he needed to keep the coaching staff, maybe bring one of his own and adage the staff, letting the coaches coach. The established coaching staff would keep the backbiting to a minimum and act as a barrier between moyes and the players, giving him time to grow to the position and earn respect. instead he encouraged the players to band together and pull against the gaffer. Hindsight is a great thing though.
Totally agree though he spent all his time and energy pissing about internally and forgot to strengthen.. I suspect he realised he didn't have the squad so rather than build bridges he decided he'd burn them, get rid and build a new squad, he probably decided this in Aug/September....
Totally mismanaged from day one... we should have known when he said he was speechless....