Help me understand. How does that line improve Lando’s character? He’d be there regardless. The only difference is whether Leia texted him to let him know they’d be in his neck of the woods.
And removing the line establishing Leia knew where he was doesn’t require us to believe in a huge coincidence, either. They’re tracing Luke’s steps by being there, which is the same event that leads Lando to be there. Leia didn’t call to tell him to go there or anything in any version.
And it doesn’t make any difference in terms of why they’d choose to follow the stranger, as the line doesn’t come until after they’ve all followed him into the trailer home.
JEDIT: You’re saying that line lets you suppose maybe Lando got a call from Leia and that’s why he is on that planet at that point in time?