Schmeichel was massive for them and I think the Cantona thing is often exaggerated; he was very influential and the ideal player to link what was a dull central midfield with a burgeoning attack as Giggs progressed but Utd signed about five players in a two year period who took them to the next level.
Alisson and Van Dijk are rightly cited as game changers for us but so were Robertson and Trent. Nailing those two positions within such a short space of time was huge.
Alisson is perfect for how we play. Excellent distribution, high concentration levels during periods where we dominate possession.
Mignolet would shout at other players after some of his horrendous mistakes; Lovren has similar reactions after his.