you are partly right and wrong.
MUFC always tried to play with a central striker and two
wings.
Mark Hughes, RVN, even Brian McClair.. a Central striker has to
hold the ball before the rest can attack.
but since RVN left, with Saha, willing to cooperate more, and also
saha being more pacey, was MUFC able to demo this fact...
Also current MUFC's play is down the maturity of Ronaldo, Carrick
and return of Scholes, EdwinVS, Vidic all contributed.
Cause now the defence is sound, they are more willing to go
forward, in the past, they tend to push to Keane or Scholes, and it
slowed down the game.
Now, they dare to push it to Carrick or even Giggs, who will then
led the charge, cause they know Rooney, Ronaldo or even Park will
be up there, and each got their own unique threat. If they fail,
their defence can still hold the fort. Not just one factor.
IMHO.