I've seen a lot of builds online that feature shallow dips into Kensai for the INT bonus to Armor Class but upon further reading it seems that those assumptions that you immediately get your entire INT bonus are incorrect. The Duelist's Canny Defense ability reads as
When wearing light or no armor and not using a shield, a duelist adds 1 point of Intelligence bonus (if any) per duelist class level as a dodge bonus to her Armor Class while wielding a melee weapon. If a duelist is caught flat-footed or otherwise denied her Dexterity bonus, she also loses this bonus.
Does this mean that a level 1 Magus can only add 1 point of his intelligence modifier to his Armor Class?