To get Cesc playing at his best, the team tactics need to be changed slightly to get the best out of him. One thing I'd say Cesc is absolutely the best in the world in, is forward defence-splitting passes. It's why he "loses possession" so much --- he's constantly on the lookout for chances to create out of thin air. He can thread the eye of a needle with his back turned, while the a hostile stadium deafens the pitch. Yes he has big weaknesses that stand out even more when trying to shoe-horn him into Xavi's role or false 9... but that's the point, isn't it? He's not Xavi, he's not Iniesta, he's not Messi. He's Cesc.
First, play him in the position he's best at, then sign a predatory striker with world class movement (Gomez? Higuain?
, Aguero?). The goals will come after that. Also, if the striker happens to be tall, then there's your plan B in case tiki-taka gets stifled by an organized defence. Cesc turned Adebayor into a 30 goal striker. When he's comfortalbe in his position, he's an incredibly useful player to have.