Questions & Mysteries What happened to Luffy’s Thor attacks?

#1
Against Chinjao, Luffy used Thor Elephant Gun, which is an Elephant Gun with lightning imbued in it. Why have we not seen any Thor moves since then?
 
#2
Forgotten or retconned just like future sight, adCoC. Many will be. Didn't you see he didn't use red roc again against Kaidou even though it is more effective than G4 boundman.
 
#3
What about snake shot that he used against Hody, that produced similar electrical effects as internal damage.
or Luffy having G4 flight and not needing Momo to taxi him to the skull.
Why hasn't Luffy actually used barrier haki defense yet?
 
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