The thing i notice about Bibeau is that on his best nights, he makes the kind of saves that only a true Elite goaltender could make. He has proven that he has this ability, whereas i have yet to see that from Gibson or Sparks.
Gibson secured the Marlies starting role with his much more consistent play. Bibeau some nights couldn't stop a beachball.
If Bibeau is able to find a way to turn those beachball nights into capable nights, then he has a pretty sure shot at an NHL future in some kind of capacity. If he finds a way to harness the truly spectacular nights on a more regular basis in addition to that, he will be a legit starter. If those spectacular nights fade off, then his career will fade off with them.
Far too soon to tell where it will all go, but he has shown ability to do some pretty epic things in net, and that alone is enough to be excited about.