Are there any Breaking Bad characters who still NEED to appear in Better Call Saul?

I've tried posting this in the BCS subreddit but it won't work for some reason.

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Cameos from someone like Hank or Walt would be fun and fanservicey, but completely unnecessary as far as the overall storyline is concerned. With Better Call Saul being a prequel, some characters like Gus and Hector NEEDED to appear for the story to flow without leaving plot holes or odd inconsistencies. If Walt Jr. never showed up prior to his introduction on Breaking Bad, it wouldn't make a difference, but if Lydia didn't show up on Better Call Saul, it would be unusual when she suddenly appears in Breaking Bad Season 5 without having played any role in Gus's earlier empire building. At this point, are there any characters left from Breaking Bad who NEED to appear for the story to flow as best as possible from "Uno" to "Felina?"

Submitted August 29, 2018 at 03:23PM by Da1tonTheGreat https://ift.tt/2PMKdUl