TV’s Frink said:
For most of these situations there are many plausible explanations (see the lightsaber on Cloud City discussion),Indeed. Because it is entirely plausible that Luke’s lightsaber fell down the main shaft at Bespin; got sucked into one of those, what, dozens of exhaust ducts; got caught up somehow, thereby preventing it from falling out and down to the fiery surface of the gas giant; was then found by someone or some thing in the duct (or wherever the duct may dump out or collect); recognized by that someone or some thing as something worth not throwing in the junk pile; then taken to – out of literally millions of planets in the galaxy – Maz Kanata, where she put it neatly in a box. In a box, to be given, someday, to someone, whom she met literally 10 or 15 minutes earlier.
Indeed, that is, in your words, an entirely “plausible explanation.”
That’s just as likely as him falling down and surviving but we can attribute “The will of The Force” to that but why can’t we apply it to this situation? Or why could it have been dumb luck that that lightsaber was found? The law of probability is a thing and if you haven’t noticed luck seems to be a motif in Star Wars.