I remember the game against Everton in the semi final at Wembley. Everton just lumping balls to Fellaini and Vidic didn't lose one header, it was demoralising for Fellaini. Vidic would just clatter into him and win the ball. It would actually be a nightmare to play against that partnership. As a striker, you try to occupy yourself against the weaker CB. Go play against Vidic, comes in the air you have no chance of winning it and your taking a hit, balls comes into feet and your getting smashed. Try run in behind and Rio is there covering, Rio himself was very good in the air and would be decent in the tackle.
Try and ghost into spaces between them in the box and VDS would be communicating behind them. It really was a fearless partnership. Some many leaders in that team, you had VDS, Rio, Vidic, Evra, Scholes, Giggs, Rooney and Ronaldo who led by example. Even players like Fletcher and Brown were proper men. Park threw himself about and of course, Tevez.