He tends to do that.
He stole basically everything from the other lanters and patchworked it onto fucking Hal and he's still a shit character.
Did the same thing with Barry Flash.
Which is why he's basically loathed and reverse flash is an annoying faggot that's in all ways inferior to Professor Zoom AND fucking Black Manta, who he stole his personality and whole petty evil bastard thing from.
Hell Johns is why they didn't pull a emerald dawn with hal and have john as the GL for the DCEU and Kyle as the new hotshot.