Better Call Saul: what we want to see
If anyone needs to disappear in Breaking Bad, they're put in touch with the vacuum cleaner repair guy and told to ask for a dust filter for a Hoover Max Extract 60 Pressure Pro. The vacuum repair guy (Jackie Brown actor Robert Forster) gives people new hope by giving them new lives and identities (we saw his services utilised by both Walt and Saul), but how does he know Saul? What's their history?
Better Call Saul HAS to provide the answer; there is no negotiation on this point - it has to happen.