@minor_runes:
I imagine if Ceasar was directly responsible for something that happened to Law's crew the two would be far more hostile towards each other. As is it seems to be an uneasy alliance (ala Jimbei/Crocodile/Luffy) towards a common end rather than the two being outright enemies.
Hmm, very good point, it may be more that Ceasar can help Law regain his crewmates somehow rather than having them outright held hostage. Whatever the specifics, I have no doubt that by arc's end, Luffy will have repaid his debt to Law somehow. Just the fact that Law made no efforts to outright get rid of Luffy and the SH seems to speak towards Oda building a fairly amicable relationship between the two, and Law swapping the straw hats' personalities was probably more of a contingency rather than a malicious tactic. I also liked the speculation that someone had posited (sorry about not going back and checking who posted it) about Oda setting this up so that Nami in Franky's body makes it a more susceptible target for CC to abduct due to his potential interest in the Vegapunk-like laser technology.
Really though, I am enjoying this relationship that Oda is creating between Law and Luffy; Luffy has enough outright enemies and rivals, so it's nice to see more frenemies. After all, Shanks has Hawk Eye, and even Roger had Garp haha. It'd be more interesting to see the eventual Kidd vs Luffy clash, now that's a face off that would pay off more.