User blog comment:Sanji The Cook/Closest to killing Luffy?/@comment-25485316-20120711224031

Lucci brought Luffy to his limits with raw physical strength. Dragon would've stopped Buggy either way. Crocodile left him to die 2 times, but he got lucky each time. Higuma.. not really. Akainu: Luffy had friends.

So yeah... Crocodile.