i've read that we have to buy him - its just a "loan" - so we can make 4 financial payments...if we buy him we can only use "3".
So in the end its 15,5M (2,5M now, we get 2,5M in Summer for Ariaudo and then pay 15,5M in 3 payments 2012, 2013, 2014), but its a huge difference if we have to...