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David Villa would provide Arsenal with an alternative option at centre-forward.
At the moment, Olivier Giroud is Arsenal's only pure centre-forward.
Although Lukas Podolski, Theo Walcott and Gervinho are all capable of playing through the middle, they are predominantly wingers. In Arsenal's current best XI, Podolski and Walcott are deployed wide of Giroud, and Gervinho is deployed on the bench.
Any injury to Giroud would significantly weaken Arsenal's hand; they badly need another striker.
Villa would be perfect. He would give Arsene Wenger another body to choose from, but also provide a real contrast to Giroud. The Frenchman is all about powerful hold-up play and aerial ability; the Spaniard's game is based on speed, movement and lethal finishing.
Arsene Wenger would have the option of picking the most appropriate striker for each opponent, without weakening his side.
Villa's versatility and ability to play on the left would also give him the option of fielding both Villa and Giroud: a mouth-watering prospect.