Can I just say a flashback in Lars in the stars wouldn't really be all that good? It'd be nice yeah because we'd see some stuff that happened off screen while Steven and the Cgs were on earth and all. But the short time limit would give us like a few things and exposition seemed to make up a lot of the preview. But that's just a preview of course. Can they just give it a spin off or a mini series even. Please this sounds whole far too interesting imo to be fit into one singular episode.
I am all up for a miniseries because like you said it is far to interesting to shove in like 1 episode but unfortunately the chance of a miniseries is so small it can not be seen with the naked eye or any microscopes in existence