That's the difference between 'odds' and 'chance' though isn't it.

'Odds' is the expected probability either way of which of the possible outcomes. Usually a binary choice, either something happens or it doesn't, but weighted more towards whichever of the outcomes is most likely.

Whereas 'chance' is the possibility of a single event occurring. And 'odds' can be applied to the 'chance' of something happening.

So you could say that there isn't a chance of Elvis landing a UFO on the Loch Ness Monsters head, because we can't prove the existence of at least 1 of those, and possibly all 3, but disregarding that lack of proof, the 'odds' of it happening, even if all 3 were proved to be in existence are extremely remote (14m:1), probably as remote as any other 3 unlikely things, such as Amelia Earhardt landing a TR-3B in Atlantis.