they still have to deal with what happens to Kim, she's not in Breaking Bad and Saul is. We know he'll survive, but something terrible may happen to her. I'm not convinced Jimmy's clear of cartel business just yet. I believe we're also going to see Walter and Jesse at some point before the season is out, will be interesting to see how they fit them in and in what capacity. Probably just a cameo.
By the time El Camino was filmed, Jesse's character was 10 years older and for some of the 2008 flashback scenes they dressed him in his original Breaking Bad outfits (baggy skater jeans, hoodie) and it just didn't quite work