So you're giving credit to the Owner and football manager (or was he CEO then?) ... either way the coach is far more influential on a teams performance than eitherI'd say Richardson and crowe had a big hand in getting them to a contender status. The five years before isn't relavent , the players they had coming through and bought set them up more so then Maguire did.
Obviously Maguire added something but I don't believe he was the man behind there premiership. You don't build a team to win the premiership and then fall off the cliff that bad if you're a great coach.