I was thinking there's probably some real cool stuff you could do in a Young Lando movie.
How he got the Falcon (and how it's saved his life quite a few times)
How he "conned" someone out of Bespin
His maneuver at the battle of taannab
His adventures as a gambler
The only thing is,he has no side characters.Han has Chewie,Jabba,( probably
Boba,Greedo and any other Bounty Hunters you want to work in) and Lando himself.
It might be best if Lando stays a supporting character in a Han film,but it's a shame they probably won't spend much time on his exploits.