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The fifth and final reason for Sir Alex to resist selling Nani in the summer is the player's dynamism.
Unlike Antonio Valencia, he has a left foot; unlike Ashley Young, he can beat a defender one-on-one and unlike Ryan Giggs, he is quick.
He is the most versatile of the four and the only one who the Scotsman could deploy on either flank and feel confident he would deliver.
Again, it must be acknowledged that Wilfried Zaha is supposed to be capable of all of the above, but there are no guarantees regarding the Crystal Palace phenom who has only played his career football in a lower league.
Nani has proven himself worthy of the hype before, he only needs to iron out the inconsistencies in his game to make the transition from a top quality player to a world class talent.
Do you think United should sell Nani in the summer?