I got handed an all-powerful ring by the last guardian of OA, which made me the last living Green Lantern while I was in an alley, getting out of a bar.

I'm pretty sure I wasn't his first choice because he went "You'll do" and basically vanished.

[ ganthet came back due to the virtue of cyclical comic book reality, but he was never kyle's mentor. though they do have a decent relationship, all things considered. ]