Only reason I wouldn't go for Leon is that Franco is at least competent in midfield, and that's as good as it gets through most of the moder day side. Would be daft to upgrade in exchange for basically any other position.
Bony V1.0 - I'll be astonished and overjoyed if we ever have a better striker than his first spell.
Gylfi - Got to have someone with a spark, and fuck all else in this team is going to take a decent set-piece. JdG unlucky to miss out in this role, as are Dyer and Sinclair (even Narsingh would be an incredible asset nowadays).
Williams - I was debating Rangel here, as I think we're marginally better at centre-half than we are at full back, but similarly, Ash is probably the best defender we had in the Premier League and a nailed on captain. I wouldn't mind a modern day Ben Davies either.