Most of the inconsistancies here are because of other writer, lets remember Georgie could give a sh1t about the EU, as long as his checks keep rolling in.
The whole dizzy spell by Obi-Won to me, is pretty much like the Ajunta Pall thing, and Exar Kun. Yoda seems to make it clear that one has to work on the technique before hand to become a living ghost within the force, but we hear no real reason why these two where able to obtain the same ability without really trying, other then some bling-bling