Did Vader really kill Obi-Wan? I dont think so.

Nobody becomes one with the Force without dying and "passing on to the other side."

Qui-Gon: Dead, body burned on funeral pyre. Takes him 13 years to contact Yoda after merging with the Force and retaining his identity.
Yoda: Dead from natural causes..then dissapears. Doesn't show he's retained his identity until the end of ROTJ.
Anakin: Dead. Body is burned on funeral pyre, shows up as "blue guy" at the end of Jedi.
Obi-Wan: DEAD. Holds his lightsaber up, dissapears as Vader makes contact with his arm/side of body.

DEAD DEAD DEAD DEAD DEAD.

 

this is what realy happened-
obi won hated luke so he wanted to trick him so he used force disapper and stripped and then he went to naboo where he started its fist nudist colony and he placed a holocom in lukes brian and thats why he sees/hears obi wan.

 

think about it

 

same as what yoda did exept for the nudist colony was on hoth