He has left WWE.
no
No, JBL was WWE Champion.
JBL has held the title longer. He has held the WWE Title for 280 days. John Cena held the WWE title longer than JBL.
JBL quit the WWE at Wrestlemania 25.
never
JBL
It is unlikely that he ever will.
No he will not come back.
Right now it is 2009.JBL is 42 right now. He was born November 29th, 1966. (JBL SUCKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!)
I can, with considerable confidence, state that the answer to this is "yes" (despite not knowing anything about the WWE or who "JBL" is). I'm fairly certain he's not actually immortal.
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stone cold,jbl