There is no proof that he's engineered this move - or that he bit someone for that reason - or that he no longer cares for Liverpool. All of that is currently media speculation and nothing more.
What seems clear though (according to a recent interview with Comolli) is that he's always had a dream of playing for one of the top two Spanish clubs. His wife lives in Barcelona and they have a house there - so LFC have known about this desire since they signed him. Of course, that's hearsay according to Comolli but has been documented elsewhere.
He had agreed terms with barca before a deal is even done. I'm not worried about him moving to barca as you can't hold it against him if it is what he always wanted.
But the guy is an utter [oops] and does not give a crap about LFC that was apparent last year when he tried to push threw a transfer to a club that we hoped to fight for a CL place. A club that had not won a trophy in years.
Take away his obvious talent he is nothing short of an utter bellend.