I always looked at as one of those moves that's meant to get a 2-count. I don't recall ever seeing Jericho beat anybody with it.
He regularly got wins with it in the WCW Cruiser division, but I can't recall a single clean finish in the WWE(f). I know he's won a couple, but that's only after a chair shot/interference/double team beatdown, etc.
The only credible win I remember him getting with it was when he and Benoit took the tag belts from Austin/HHH. But that was a long match and it made sense that a Lionsault could have finished it.
Don't forget HHH hitting Austin with a sledgehammer before that.I don't remember heel Jericho in wcw winning with the Lionsault that much,it was usually the Liontamer.