Think we should pass on Messi. In 7 or 8 years or so he will start losing a bit of his pace, and then I wouldn't trust him to do it on a rainy February night in Stoke. He doesn't win many headers either. Doubt he could lead our line well therefore.
I think we should go all in for Downing instead. Convert him to an RB, convert Sagna to a CB, and stick Mertesacker up front. Genius.