Ahh, the sword!sex. (I tend to think of that entire scene as foreplay.) CotBP probably established J/W as the dominant relationship, even over W/E, even if you only regard it as friendship/comraderie. It isn't the relationship that drives everything - but it is the one that ends up resolving things.

Jack IS a little too preoccupied with Will's genitals, isn't he? (And Barbossa's later on - one wonders just how insecure Jack is about his own wedding tackle. *G*)

all I can think of is "That was supposed to be Will, darn it all."

That's sort of how I feel every time Jack breathes on Will to knock him off the ship. "That was supposed to be a kiss dammit."