User blog comment:Black Leg Sanji/Time Skip Power/@comment-1595565-20100912152642/@comment-1595565-20100912154235

I would like to think that, but the others don't really have any means of learning it. Nami is studying the weather, Chopper is studying medicine, Usopp is getting in shape, and Brook is technically a hostage. Zoro and Sanji on the other hand, are all training with someone who is very knowledgable about different different types of combat skills, which may or may not be extended to include Haki. Robin has a chance to maybe learn about it from Dragon and Franky might stumble across something about it in Vegapunk's lab, but that's about it.