The hottest transfer news especially in England is the transfer of Robin Van Persie from Arsenal to their greatest arch-rivals Manchester united.It would be difficult to predict reasons why Sir Alex Ferguson chose to sign RVP since the attacking options has not been a problem for United in the past three seasons.The Dutch international completed his move from the Gunners to United in a deal worth 24 million Pounds. The Dutchman was the English Premier League’s top scorer last season with 30 goals.A Player of RVP calibre is not suitable for the bench and if he does not start as many games as possible he will suffer a decline performance-wise and physiologically.At United with Sir Alex Ferguson at the helm, you are never guaranteed first team football. Additionally, Van Persie has never scored more than Rooney or former Chelsea hitman Didier Drogba apart from last season, meaning that he is not very consistent.RVP will have to face stiff competition from Danny Welbeck, Rooney and Chicarito with hope that Dimitar Berbatov is sold to another club before the transfer window closes.Though Van Persie has sharp feet in front of the goal mouth with good pace, he lacks the imaginative power to beat off Rooney and Welbeck for the starting position.Manchester United’s attack rotates around Rooney, the only forward at Old Trafford assured of a starting place, which means RVP will have to fight for a place on the team against Welbeck, Chicarito and Berbatov if he stays.Rooney’s work rate is very high and this suits modern strikers, while his new strike partner RVP plays a different style as he is a player to be fed in order to score goals.RVP is the type of striker who contributes less to the overall performance of the whole team. He does not drop back to pick lost balls in the midfield and would only be used as a target man.I also think that Welbeck plays better football than the outgoing Arsenal captain. Welbeck is physically stronger than RVP. The English international has good physical condition with an admirable pace; he is very imaginative on the ball than probably any striker at old Trafford. He fights for the ball whenever he loses it and is certainly a better player to deploy as a target man than RVP, but that is for Ferguson to decide.Pundits are asking themselves why Ferguson has chosen to buy a player, who is not any better than those already at Old Trafford. Manchester United need a top quality central midfielder or even a world class defender more than a striker. Scoring goals is not the main problem for Ferguson’s team.Defender Nemanja Vidic has become injury prone and is no longer reliable for long term services. He has weakened in terms of his physique.Likewise, Rio Ferdinand and Jonny Evans have suffered performance depletion of recent leaving United with no very reliable man in their defence. In the central midfield, United has to rely on the likes of Michael Carrick, Darren Fletcher and veteran Paul Scholes.United should have brought in a central midfielder or defensive player and not a striker. In modern football, goals win matches but you must be able to defend them must as you score them.