It’s not a coincidence that Han goes to Maz.
True enough. I’m not saying that it’s complete coincidence that Han went to Maz. I’m just saying that it wasn’t a foregone conclusion that Han would go there, since there would theoretically be other trustworthy captains in other ports. But yes, I’ll concede that point.
What is certainly true however is that Han didn’t know that Maz had the lightsaber. He’s as surprised as anyone that she has it, and that’s my point.
I should back up a bit and explain why this whole tenuous connection between Rey and the lightsaber is bothersome. With Obi-wan as the keeper of Luke’s lightsaber, Luke receiving it wasn’t coincidental at all. It presumably would have happened sooner or later, when Obi-wan deemed it necessary.
With Rey, she only comes in contact with the lightsaber because the Resistance droid happened to bump into her house in the desert, which led her taking the Falcon (as her second choice, mind) to escape the First Order, which led her to Han, who led her to Maz, who just so happened to have the lightsaber. That’s five leaps of coincidence, or four if you consider it a foregone conclusion that Han would send Rey to Maz. Although none of these alone are enough to take me out of the movie, when I realized that all of them had to happen in order for Rey to get the lightsaber, the compounded effect of them was enormous.
The takeaway here is that JJ clearly predicted that everyone would argue endlessly about this stuff, which is why he gave everyone 3 or 4 letter names.