It’s hard to go back and think about Glenn dying only in the context of the comics, without all those squelching noises heard on TV, though I’d have to imagine that if Scott Gimple & Co. ever do get around to presenting Gabriel’s death in live-action, either faithfully or using another character, it will be just as sickening to watch as the Glenn and Abraham Incident was.
None of Father Gabriel’s initial untrustworthiness is coming out of Seth Gilliam in making those claims there, as Father Gabriel’s comic book death was indeed about as hardcore as it gets for anyone within The Walking Dead universe.
And there’s no denying that he believes the character’s multi-tiered doom was a more effectively harrowing way to die than Negan treating Glenn’s skull like a Whack-a-Mole game.