Not too many people are able to come back after years off form...
It's not like he had many years off form. In 2008-09 his first season with Milan was disastrous, but in 2009-10 he had 12 goals and 16 assists in 36 appearances, a better season than the average of his carreer, and similar to his two first seasons at Barcelona (he was only more decisive in 2005-06 and 2006-07).
Not to say I'd want Liverpool to pay for him, but I think he's not a proven has been and may very well have one or two good seasons in his future. If we could have him for no transfer fee, I'd consider him a rather good move despite his wages.
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